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Longform data analysis article arguing every “dataset” is actually three: Observed (captured rows), Missing (what should exist but doesn’t), and Excluded (what filters/joins/dropna removed). Includes dataset accounting, join-loss and missingness audits, segmentation checks, and practical templates to prevent biased KPIs and wrong conclusions.
Checks whether your backtest data is lying to you: survivorship detection and CI integrity gates for financial price panels.
Classify CRSP-style delisting reasons from SEC EDGAR for quant pipelines
Survivorship-free quantitative equity research for NSE India. Point-in-time universe rebuilt from NSE bhavcopy (1,337 symbols incl. 180 delisted), FIFO tax lots, next-close execution. Net +20.7% CAGR vs Nifty TRI +11.0%, excess Sharpe 0.89. Paper mode; DSR/PBO validated.
Reproducible open pipeline for publication-grade global equity data — survivorship-bias-free, point-in-time, identity-resolved. Bring your own API key.
Complete list of 36,000+ delisted stocks from NYSE, NASDAQ, and OTC exchanges. Daily SEC EDGAR updates since 2002 with ticker, CIK, filing dates, exchange, and direct filing links.
A point-in-time, search-aware evaluation of retail-constrained equity anomalies: no tested return edge survives honest evaluation; volatility predictability replicates as the positive control. Fully reproducible.
Point-in-time NSE index membership and survivorship-free universes, with a harness that measures survivorship bias per strategy instead of hand-waving at it.
An honest, survivorship-bias-corrected backtesting engine. Market-agnostic — Indian equities (Nifty 50/100/200/500) wired in out of the box, extensible to US/global via yfinance. Tax-aware, free data, Python + DuckDB.
A Claude Code Skill that detects 9 classes of statistical pitfalls in everyday claims (medical, social media, LLM benchmarks). Outputs dashboard PNG + journal-style HTML report + Markdown.
Synthetic research-bias validation toolkit for systematic trading research.
How stocks performed in their first year after being removed from the Nasdaq-100 — a self-contained dashboard and per-stock deep-dives benchmarked against QQQ.
Audit point-in-time universe membership, security lifecycles, stable identities, and missing delisting returns before backtesting.
Open dataset (CC BY 4.0) behind the Crawlora study The Podcast Gold Rush and the Graveyard You Cant See — the discoverable head of Apple Podcasts (US, June 2026): charts + search samples with episode counts, podfade and genre, plus an Apple-vs-Spotify Top-100 overlap.
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