fin-eda

Comprehensive financial Exploratory Data Analysis for any stock ticker, price series, or portfolio of tickers. Produces a numerical tearsheet (eda) and a visual tearsheet (eda_plot) covering returns, risk, drawdowns, benchmark comparison, volatility, liquidity, and more — all in one call.

Installation

# Numerical tearsheet only
pip install fin-eda

# Numerical + visual tearsheet
pip install fin-eda[plot]

# Numerical + PDF export
pip install fin-eda[pdf]

# Everything
pip install fin-eda[plot,pdf]

Quick Start — Numerical (eda)

from fin_eda import eda

# Fetch data automatically via yfinance
eda("AAPL")

# Custom date range
eda("MSFT", start="2020-01-01", end="2024-01-01")

# Custom period
eda("TSLA", period="5y")

# Different benchmark
eda("QQQ", benchmark_ticker="SPY")

# Include a risk-free rate
eda("AAPL", risk_free_rate=0.05)

# Pass your own price series
import pandas as pd
prices = pd.Series(...)
eda(prices, benchmark_ticker="SPY")

# Return results as a dict (no print)
results = eda("AAPL", return_results=True, quiet=True)

# Portfolio of tickers — equal-weight by default
eda(["AAPL", "MSFT"])                                    # 50% / 50%

# Portfolio with custom weights (must sum to 1)
eda(["AAPL", "MSFT", "GOOGL"], weights=[.4, .3, .3])

# Export the report to PDF — requires pip install fin-eda[pdf]
eda("AAPL", save_path="aapl_report.pdf")

# PDF only, no terminal output
eda("AAPL", quiet=True, save_path="aapl_report.pdf")

Quick Start — Visual (eda_plot)

Requires pip install fin-eda[plot].

from fin_eda import eda_plot

# Full tearsheet
eda_plot("AAPL")

# Select specific panels
eda_plot("AAPL", panels=["price", "drawdown", "distribution", "heatmap"])

# Save to file (PNG, PDF, SVG — format inferred from extension)
eda_plot("MSFT", save_path="msft_tearsheet.png")
eda_plot("MSFT", save_path="msft_tearsheet.pdf")

# Return the Figure for notebook embedding or further customisation
fig = eda_plot("TSLA", period="5y", return_fig=True)

# Custom benchmark and risk-free rate
eda_plot("QQQ", benchmark_ticker="^GSPC", risk_free_rate=0.05)

# Portfolio of tickers, same weighting rules as eda()
eda_plot(["AAPL", "MSFT", "GOOGL"], weights=[.4, .3, .3])

Available panels

Name	Description
price	Price history with 50D/200D moving averages and volume
cumulative	Cumulative return vs benchmark with shaded outperformance gap
drawdown	Underwater drawdown chart with top-3 trough annotations
heatmap	Monthly returns heatmap (year x month grid)
annual_returns	Year-by-year return bars (green/red) with benchmark overlay
distribution	Daily return histogram with normal overlay and VaR lines
rolling_beta	Rolling 1Y (252D) beta vs benchmark, shaded above/below beta = 1
rolling_sharpe	Rolling 252D and 126D annualized Sharpe ratio

Benchmark-dependent panels (cumulative, rolling_beta) are automatically skipped if no benchmark data is available.

Portfolio Support

Both eda() and eda_plot() accept a list of tickers instead of a single ticker or price Series, combining them into a portfolio:

eda(["AAPL", "MSFT"])                                     # equal weight: 50% / 50%
eda(["AAPL", "MSFT", "GOOGL"], weights=[.4, .3, .3])       # custom weights

• Weighting. weights defaults to equal weight (1/n) when omitted. When given, it must have one entry per ticker (matched by position) and sum to 1.0, or a ValueError is raised. Negative weights (shorts) are allowed.
• Buy-and-hold, not rebalanced. Weights are applied once — converted into an implied share count at the first date common to every ticker's history — and each holding's dollar value then drifts independently with its own price path. Actual portfolio weights drift away from the values passed in as constituents over- or under-perform each other over time; there is no daily rebalancing.
• Date alignment. Tickers are combined over the trading dates common to all of them (intersection), not a union with forward-filled gaps — the same alignment strategy eda() already uses for benchmark comparison.
• Price is rebased. The combined portfolio price series starts at 100 (an arbitrary base value). This only affects absolute price/level readouts (header price, moving-average levels, 52-week high/low) — every percentage-based metric (returns, CAGR, drawdown, volatility, Sharpe, ...) is unaffected by the rebasing.
• No OHLCV. There's no single meaningful High/Low/Volume for a weighted basket of tickers, so Parkinson volatility, Liquidity metrics, and the price panel's volume bars are unavailable for a portfolio — same as when a raw price Series is passed instead of a ticker.
• Everything else works unchanged, including benchmark comparison (beta, correlation, capture ratios, Treynor, Jensen's alpha, cumulative/rolling_beta panels) against the portfolio's combined return series.

Output

eda() renders in the terminal using Rich with colour-coded values (green = positive/good, yellow = neutral, red = negative/risk).

The header panel shows:

• Ticker or series label, current price, and the benchmark symbol actually used
• Data coverage: number of trading days and date range
• 50D/100D/200D moving average levels and the 50D-200D spread
• Price distance from the 200D MA and trend persistence (% days above 200D MA)
• 52W price range (low - high), days since the 52W high, and drawdown from the 52W high

Below the header, one table is printed per section. Period columns (e.g. 1M, 1Y, 5Y, 10Y) are shown only when the available data is sufficient to support them — longer columns appear automatically as data coverage grows, up to 30Y. An All Time column is always shown alongside the named tenors and reports on the full fetched history, regardless of whether it exactly clears a round-number tenor threshold (e.g. a period='10y' fetch typically yields a bit under 2,520 trading days once holidays and the return-series offset are accounted for, so the 10Y column may not appear even though All Time — covering the same ~10 years — does).

eda_plot() produces a single dark-themed matplotlib figure with up to 8 panels. Use save_path to export, or return_fig=True to get the Figure object.

Metrics Covered

Section	Key Metrics
Core Return & Risk	Cumulative return, CAGR, arithmetic and geometric mean daily return, median daily return, excess return over risk-free rate, standard deviation, annualized realized volatility, annualized variance — across 1M, 3M, 6M, 1Y, 3Y, 5Y, 10Y, 15Y, 20Y, 25Y, 30Y, All Time, YTD
Risk-Adjusted Performance	Sharpe ratio, Sortino ratio, Omega ratio, Calmar ratio, Treynor ratio, Jensen's alpha, downside deviation, semi-variance, profit factor, win rate, average return on up days, average return on down days, gain-loss ratio — from 6M+ for period ratios
Drawdown & Capital Destruction	Max drawdown, average drawdown, time to recovery, max consecutive loss days — from 3M+
Trend Structure & Price Health	50D/100D/200D moving average levels, price vs 200D MA, golden/death cross spread, trend persistence, 52W high price, 52W low price, time since 52W high, drawdown from 52W high
Relative Performance vs Benchmark	Geometric excess return vs benchmark, tracking error, information ratio — from 6M+
Beta, Correlation & Market Dependence	Beta vs market, correlation vs market, R-squared vs market — from 3M+
Capture Ratios	Up-market and down-market capture (annualized geometric) — from 6M+
Return Distribution & Non-Normality	Skewness, excess kurtosis — from 3M+
Tail Risk & Stress	Historical VaR (95% and 99%), Expected Shortfall/CVaR (95%) for 1Y+, best and worst daily/weekly/monthly return, extreme loss frequency beyond -2 sigma and -3 sigma
Volatility Metrics	Parkinson (high-low) volatility (21D/63D/126D), rolling volatility percentile, volatility of volatility, current 21D vs 1Y volatility ratio
Liquidity Metrics	Average daily volume (30D/90D)
Annual Returns	Calendar-year return for each year in the data, partial current-year return, best and worst calendar year

Period columns scale automatically with available data. With 1Y of data the output caps at 1Y columns; with 30Y of data all columns through 30Y render.

Parameters

eda() — shared with eda_plot()

Parameter	Type	Default	Description
ticker_or_prices	str, pd.Series, or list[str]	—	Yahoo Finance ticker, a Series of close prices indexed by date, or a list of tickers to combine into a buy-and-hold portfolio (see Portfolio Support above and weights below)
benchmark_ticker	str or None	'SPY'	Benchmark symbol. Falls back to ^GSPC only if the requested ticker fails to fetch or returns no data. Pass None to disable benchmark metrics entirely
risk_free_rate	float	0.0	Annual risk-free rate used in Sharpe, Sortino, Omega, Treynor, and Jensen's alpha (e.g. 0.05 for 5%)
weights	list[float] or None	None	Only valid when ticker_or_prices is a list of tickers. Per-ticker weights matched 1:1 by position, must sum to 1.0 (raises ValueError otherwise). Defaults to equal weight (1/n) when omitted
period	str or None	'10y'	yfinance history period ('1y', '5y', '10y', 'max', etc.). Ignored when start/end are provided
start	str or None	None	Start date in YYYY-MM-DD format
end	str or None	None	End date in YYYY-MM-DD format

quiet is not shared — it has different scope in each function (see below).

eda() only

Parameter	Type	Default	Description
return_results	bool	False	When True, return the full metrics dict in addition to (or instead of, if quiet=True) printing the report
quiet	bool	False	Suppress the entire printed report (including error messages), not just status output. Use this with return_results=True when you only want the metrics dict — e.g. to pull one figure out of it — without the terminal tearsheet
save_path	str or None	None	Export the report to this PDF path. Independent of quiet — a PDF is written even when the terminal report is suppressed, including for error results. Requires pip install fin-eda[pdf]

eda_plot() only

Parameter	Type	Default	Description
panels	list[str] or None	None	Panels to render. None renders all available panels. See panel name table above
save_path	str or None	None	Save the figure to this path before displaying. Format inferred from the extension (.png, .pdf, .svg, or any matplotlib-supported format) — unlike eda()'s save_path, which is always a PDF report, not a figure
return_fig	bool	False	Return the matplotlib.Figure object instead of calling plt.show()
quiet	bool	False	Suppress status/warning messages only (benchmark fetch, panel render failures, save confirmation). Never suppresses the figure itself — there's no "just the numbers" mode for a visual tearsheet, so this only quiets console noise, not the plot

Calculation Notes

Returns and CAGR. Cumulative returns use log-sum form (expm1(sum(log1p(r)))) for numerical stability on long histories. CAGR is derived from the same log-sum: expm1(log_sum x 252 / n).

Excess return vs benchmark. Reported as the geometric excess: (1 + asset_return) / (1 + benchmark_return) - 1. This avoids the distortion of arithmetic differences over long compounding periods.

Sharpe ratio. Daily excess returns divided by their standard deviation, annualized by sqrt(252), per Sharpe (1994).

Sortino ratio. Uses sqrt(E[min(r - rf, 0)^2]) as the downside deviation denominator — all periods enter the average, with positive days contributing zero. This is the formulation from Sortino and Price (1994) and differs from implementations that take the standard deviation only of the negative tail.

Downside deviation and semi-variance. Same RMS-over-all-periods formula as the Sortino denominator, annualized.

Omega ratio. sum(max(r - rf, 0)) / sum(max(rf - r, 0)) — a full-distribution gain/loss ratio that does not assume normality.

Calmar ratio. CAGR divided by the absolute value of the maximum drawdown for the same period.

Treynor ratio. (CAGR - annual_rf) / beta.

Jensen's alpha. asset_CAGR - (rf + beta x (bench_CAGR - rf)) — CAPM-expected return removed from realized CAGR.

CVaR / Expected Shortfall. Mean of all daily returns at or below the historical 5th percentile (95% confidence). Reported for periods of 1Y and above.

Parkinson volatility. sqrt((1 / (4T ln 2)) x sum(ln(H/L)^2) x 252) per Parkinson (1980).

Dependencies

Core (installed automatically):

• pandas
• numpy
• scipy
• yfinance
• rich

Optional (for eda_plot, installed via pip install fin-eda[plot]):

• matplotlib >= 3.5

Optional (for PDF export from eda, installed via pip install fin-eda[pdf]):

• fpdf2 >= 2.7

License

MIT

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Changelog

2.0.0

New

• Portfolio / multi-ticker support — both eda() and eda_plot() now accept a list of tickers instead of a single ticker or price Series, combining them into a buy-and-hold portfolio. Equal weight (1/n) by default; pass weights=[...] for custom allocations (must sum to 1.0). Weights are applied once, converted into an implied share count at the first date common to every ticker's history, and each holding then drifts independently with its own price path — not rebalanced daily. Tickers are aligned on their common trading dates (intersection). High/Low/Volume-based metrics (Parkinson volatility, liquidity, price-panel volume bars) are unavailable for a portfolio, same as when a raw price Series is passed. See the new "Portfolio Support" section above.
• PDF export from eda() — pass save_path='report.pdf' to export the numerical tearsheet as a PDF, independent of quiet (so eda(..., quiet=True, save_path=...) produces a silent, PDF-only export). Requires the new optional fpdf2 dependency: pip install fin-eda[pdf]. The PDF mirrors the printed report exactly — same header, same section/period/scalar tables, same red/green/yellow color coding — since both renderers now share the same underlying formatting and classification logic. (eda_plot() already supported PDF export via its existing save_path, which infers the format — PNG/PDF/SVG — from the file extension.)
• All Time period column — eda()'s period-based tables now always include an All Time column reporting on the full fetched history, regardless of whether it exactly clears a round-number tenor threshold. Previously, a period='10y' fetch that yielded a few trading days short of the exact 2,520-day 10Y threshold (common, since real calendars rarely land on an exact multiple of 252 trading days/year) would silently drop the 10Y column with no alternative — All Time now always renders for whatever window was actually fetched.

Bug fixes

• eda() silently produced no output on a bad ticker or insufficient data — a failed fetch or empty return series returned an {'error': ...} dict directly, bypassing the report printer entirely (including _print_eda_report's own dedicated error-display branch, which was unreachable dead code as a result). Called the normal way (eda("BADTICKER"), return value not captured), this was a silent no-op. Both error paths now route through the printer (respecting quiet) and now also respect return_results consistently, matching the function's own documented return contract.
• Non-DatetimeIndex price Series crashed eda()/eda_plot() — a benchmark-window helper introduced in 1.2.5 called .strftime() unconditionally on a raw price Series' index, before any benchmark-enabled check, so passing a Series with a non-date index (e.g. a default RangeIndex) crashed immediately even with benchmark_ticker=None. Now falls back to an unbounded benchmark window instead of crashing.
• ANNUAL_RETURNS double-counted and mislabeled the current year — the still-open calendar year's resampled bin was reported both as an unqualified "{year} annual return" (implying a complete year) and correctly as "{year} annual return (partial)", and the mislabeled version could win/lose Best/Worst annual return against genuinely complete years. Now excluded from the complete-year bucket and reported only under the (partial) label — corrected further to test the last data year against today's real-world year (not just "whichever year is last in the data"), so a call bounded by end='2023-12-31' made in 2026 correctly treats 2023 as complete rather than partial.
• eda_plot()'s annual_returns panel didn't distinguish the partial year at all — silently plotted it as an ordinary bar, indistinguishable from a complete year. Now rendered hatched, at reduced opacity, with a (YTD) suffix on its tick label — matching the table's (partial) treatment.
• UnicodeEncodeError on Windows terminals using a legacy codepage — eda()'s "Extreme loss frequency (beyond −2σ)" labels used a Unicode minus sign and Greek sigma, neither in the cp1252 codepage many Windows consoles still default to. Relabeled to plain ASCII (-2 sigma), matching wording the README already used.
• Zero-display values (0.00%, -0.00%) got an arbitrary red or green — sign-dependent color coding (e.g. Jensen's alpha) was driven by the raw value's sign even when that sign was too small to actually show at the displayed precision, so visually-identical 0.00% cells could render as red, green, or yellow depending on invisible floating-point noise. These now render as plain/neutral text.
• eda_plot()'s distribution panel still showed a Jarque-Bera p-value that eda() deliberately dropped in 1.2.0 (near-certain to reject normality for financial return series regardless of economic significance) — removed for parity.
• Benchmark fetch status message didn't say what it was fetching for — "Fetching benchmark data for SPY..." gave no indication of the underlying ticker or portfolio being analyzed when multiple eda()/eda_plot() calls' output interleaved. Now includes it: "Fetching benchmark data for SPY (underlying: AAPL)...".

Documentation

• Removed Amihud illiquidity ratio and volume trend from the README's Liquidity Metrics description and Calculation Notes — documented but never implemented in code.
• Removed stale EDA_PLOT_PLAN.md references to the beta_scatter and rolling_vol panels, both removed from eda_plot() in 1.2.5.
• Clarified that quiet is not a shared parameter despite the identical name in both functions: eda(quiet=True) suppresses the entire report (useful with return_results=True when only the metrics dict is wanted), while eda_plot(quiet=True) only suppresses status/warning messages — never the figure itself, since there's no "just the numbers" mode for a visual tearsheet.

Code quality

• Extracted _classify_value() (color decision) and _split_section_metrics() (period/scalar splitting, NaN-row dropping, active-column filtering) out of _print_eda_report() as shared, output-format-agnostic helpers, so the Rich console renderer and the new PDF renderer derive identical table structure and coloring decisions from one source instead of two independently-drifting copies.
• Removed several small dead-code instances: an unreachable defensive check in _calculate_time_to_recovery, a benchmark-returns variable unconditionally overwritten before ever being read, and two unused variable captures in eda_plot()'s histogram and heatmap panels.

1.2.5

Bug fixes

• Benchmark alignment silently narrowed unrelated metrics — in both eda() and eda_plot(), attaching a benchmark (the default SPY) intersected the asset's return series down to only the dates the benchmark also traded on, and that narrowed series then fed every metric/panel, not just the benchmark-comparison ones. Two tickers with a mismatched trading calendar (e.g. different exchange holidays) could silently shift CAGR, Sharpe, volatility, skewness, VaR, and drawdown numbers depending on whether a benchmark was attached at all. Core return/risk metrics and panels now always use the asset's full history; only the benchmark-comparison metrics/panels (beta, correlation, capture ratios, Treynor, Jensen's alpha, cumulative, rolling_beta) use the calendar-aligned pair.
• Benchmark fetch ignored period/start/end — the benchmark ticker was always fetched with period='max' regardless of what window was requested for the primary asset, so eda('AAPL', period='5y') correctly pulled ~1,260 days of AAPL but then downloaded SPY's entire trading history (8,000+ days) before intersecting it down. The benchmark fetch now mirrors the primary ticker's requested window (or, when a raw price Series is passed instead of a ticker, is bounded to that series' own date range).
• OHLCV auxiliary series reindexed to the narrowed calendar — high/low/volume were reindexed to the benchmark-shrunk return index rather than the asset's own price index, so Parkinson volatility and liquidity metrics (and the price panel's volume bars) could show gaps that had nothing to do with missing asset data. Now reindexed to the asset's own price history.
• eda_plot() mislabeled the benchmark on fallback — if the requested benchmark failed to fetch and the code fell back to ^GSPC, chart legends still displayed the originally-requested symbol (e.g. SPY) instead of the benchmark actually plotted. eda() already tracked this correctly; eda_plot() now does too.
• eda_plot() crashed on a non-DatetimeIndex price Series — the figure title's date-range formatting called .strftime() unconditionally, outside the per-panel error handling, so passing a raw Series without a datetime index (e.g. a default RangeIndex) crashed the whole call instead of degrading gracefully.

eda_plot() — panel changes

• Removed beta_scatter (Daily Return Scatter vs Benchmark) and rolling_vol (Rolling Volatility Regime). Default tearsheet is now 8 panels.

Code quality

• Extracted the benchmark-fetch-with-^GSPC-fallback logic (previously duplicated near-verbatim in eda.py and plot.py, which is how the alignment and period bugs above ended up in both places independently) into a shared internal module, fin_eda._market_data.
• eda_plot()'s panel-render loop no longer special-cases rolling_sharpe by name; render failures are now also surfaced as a console warning (in addition to the in-panel placeholder) instead of failing silently.
• Silenced a spurious RuntimeWarning from the rolling-Sharpe calculation on zero-volatility (flat-return) stretches.

1.2.0

New metrics

• CAGR — annualized geometric return (expm1(log_sum x 252 / n)) added to Core Return & Risk for every period.
• Calmar ratio — CAGR divided by absolute max drawdown, per period.
• Treynor ratio — annualized excess return per unit of beta, per period (requires benchmark).
• Jensen's alpha — CAPM-adjusted outperformance (asset CAGR minus the CAPM-predicted return), per period (requires benchmark).
• Omega ratio — full-distribution gain/loss ratio above the risk-free threshold, per period.
• Win rate — percentage of trading days with a positive return (full history scalar).
• Average return on up days / down days — mean daily return on positive and negative days separately (full history scalars).
• Gain-loss ratio — average daily gain divided by the absolute average daily loss (full history scalar).
• Tracking error — annualized standard deviation of active (asset minus benchmark) daily returns, surfaced explicitly alongside the information ratio.
• R-squared vs market — square of the correlation with the benchmark, per period.
• Best daily / weekly / monthly return — counterpart to the existing worst-period metrics.
• 52W high price and 52W low price — absolute price levels added to Trend Structure & Price Health.
• Annual returns — new section with a calendar-year-by-year breakdown, partial current-year return, and best/worst calendar year summary.

Calculation corrections

• Sortino ratio and downside deviation — corrected to use sqrt(E[min(r - rf, 0)^2]) averaged over all periods (Sortino and Price, 1994). The previous implementation used std(negative_tail_returns), which divides by the count of negative days only and measures dispersion around the negative-tail mean rather than around the threshold — both incorrect.
• Excess return vs benchmark — changed from arithmetic (asset_cum - bench_cum) to geometric ((1 + asset_cum) / (1 + bench_cum) - 1). Arithmetic excess is misleading for periods beyond 2-3 years.
• 52W high date comparison — replaced is not pd.NaT with not pd.isna() for correct behaviour with timezone-aware timestamps returned by recent yfinance versions.

Removed metrics

• Jarque-Bera statistic — removed from Return Distribution & Non-Normality. For most financial return series the statistic is near-certain to reject normality regardless of sample size or economic significance; skewness and kurtosis convey the distributional shape more directly.
• Return autocorrelation — the Regime & Time-Series Behavior section (1D, 5D, 21D autocorrelation lags) has been removed from the numerical tearsheet.

Display improvements

• Header now shows: current price, the benchmark symbol actually used (including when the fallback to ^GSPC is triggered), and the full data coverage line (trading day count and date range).
• 52W section in the header now shows actual high and low prices alongside the existing days-since-high and drawdown figures.
• Period columns are suppressed automatically when all values for that column are NaN, so the output scales from the shortest available window up to 30Y without manual configuration. Long-period columns (15Y, 20Y, 25Y, 30Y) appear as data coverage grows.
• Each section table uses a descriptive row label (e.g. "Risk-Adjusted Metric", "Benchmark Comparison", "Calendar Year") instead of the generic "Metric".
• Best-period metrics (best daily, weekly, monthly, annual) are always coloured green; worst-period metrics remain always red.

1.1.1

eda_plot() — panel changes

• Added annual_returns: Year-by-year geometric return bars (green/red) with optional benchmark overlay. Annotates each bar when 15 or fewer years of data are shown.
• Added rolling_beta: Rolling 1Y (252D) beta vs benchmark computed as cov(asset, bench) / var(bench). Shaded above beta = 1, shaded below. Current beta annotated.
• Rolling Sharpe primary window clarified: 252D (1Y) is primary, 126D (6M) is the secondary overlay.

Bug fixes

• Benchmark fetch threshold — the previous check (len > 25 x 252 trading days) silently fell back to ^GSPC for any benchmark with less than roughly 25 years of history (e.g. GLD, sector ETFs, international funds). Now accepts any non-empty result; period='max' is used to retrieve full available history. Fallback to ^GSPC only triggers on a failed fetch.
• Distribution normal overlay — std now uses ddof=1 (sample standard deviation) to match the convention used by stats.skew and stats.kurtosis in the same panel.

1.1.0

New: eda_plot() — visual tearsheet

• 10-panel dark-themed matplotlib tearsheet mirroring all eda() inputs.
• Panels: price history, cumulative return vs benchmark, underwater drawdown, monthly returns heatmap, annual returns, return distribution, beta scatter, rolling beta, rolling Sharpe, and rolling volatility regime.
• panels=[...] parameter for rendering any subset of panels in one call.
• save_path parameter to export to PNG, PDF, SVG, or any matplotlib-supported format.
• return_fig=True for notebook embedding or programmatic figure composition.
• Benchmark-dependent panels degrade gracefully when data is unavailable.
• Style applied via mpl.rc_context — does not pollute the caller's global matplotlib state.
• Added as an optional dependency: pip install fin-eda[plot].

1.0.1

Bug fixes

• YTD period — corrected to use the current calendar year at runtime rather than the last year present in the data, which produced wrong results when analyzing historical series ending before the current year.
• Average drawdown — now returns no data when a period has no negative drawdown observations, instead of incorrectly showing 0.0.
• Time to recovery — now returns no data when a period has no drawdown to recover from, instead of showing 0 (which implied an instantaneous recovery had occurred).
• Volatility of volatility key name — internal key mismatch between the success and failure paths caused the metric to appear twice in the output under different names. Now consistently labeled.
• quiet=True not fully respected — benchmark data-fetch status messages were always printed to stdout regardless of the quiet flag. They now correctly respect quiet=True and route through the Rich console for consistent formatting.
• Monthly return resampling — added compatibility fallback for pandas < 2.2, where the 'ME' month-end alias was not yet available.

Numerical improvements

• Cumulative and geometric mean returns — switched from chained .prod() to log-sum form (np.expm1(np.log1p(r).sum())). Mathematically equivalent, but avoids floating-point overflow on very long return histories (20Y+) and resolves a pandas type-stub incompatibility with newer versions.
• Capture ratios — same log-sum refactor applied to up- and down-market annualization, eliminating potential overflow for assets with extreme up-market streaks.

Code quality

• period, start, end, and benchmark_ticker parameters now carry correct Optional[str] type annotations (previously typed as str despite accepting None).
• Period-pattern regex precompiled at module load time instead of on every report render.
• Removed stale internal comment referencing previously deleted metrics.
• Docstrings added to all internal helper functions.