{"slug":"what-is-stock-beta","qid":"vol_split","label":"vol_split","post_title":"what-is-stock-beta","post_url":"/blog/lang/tl/what-is-stock-beta#q-vol_split","columns":["ticker","total_vol_pct","idio_vol_pct","unexplained_share_pct"],"rows":[{"ticker":"TSLA","total_vol_pct":58.1,"idio_vol_pct":46.8,"unexplained_share_pct":64.9},{"ticker":"NVDA","total_vol_pct":46.8,"idio_vol_pct":34.9,"unexplained_share_pct":55.4},{"ticker":"AAPL","total_vol_pct":26.8,"idio_vol_pct":21.4,"unexplained_share_pct":63.9},{"ticker":"MSFT","total_vol_pct":26.3,"idio_vol_pct":21.7,"unexplained_share_pct":68},{"ticker":"JNJ","total_vol_pct":18,"idio_vol_pct":18,"unexplained_share_pct":100},{"ticker":"KO","total_vol_pct":16.7,"idio_vol_pct":16.7,"unexplained_share_pct":100}],"shape":"ranking","sql":"WITH\n    daily AS\n    (\n        SELECT\n            ticker,\n            date,\n            toFloat64(close) AS px,\n            lagInFrame(toFloat64(close)) OVER (PARTITION BY ticker ORDER BY date ROWS BETWEEN 1 PRECEDING AND 1 PRECEDING) AS prev_px\n        FROM global_markets.stocks_daily_aggs\n        WHERE ticker IN ('SPY', 'AAPL', 'MSFT', 'NVDA', 'TSLA', 'KO', 'JNJ')\n          AND date >= '2023-10-01'\n          AND date <= '2026-09-30'\n    ),\n    rets AS\n    (\n        SELECT ticker, date, px / prev_px - 1 AS ret\n        FROM daily\n        WHERE prev_px > 0\n    )\nSELECT\n    s.ticker                                                                                    AS ticker,\n    round(100 * stddevPop(s.ret) * sqrt(252), 1)                                                AS total_vol_pct,\n    round(100 * stddevPop(s.ret) * sqrt(252) * sqrt(greatest(1 - pow(corr(s.ret, m.ret), 2), 0)), 1) AS idio_vol_pct,\n    round(100 * (1 - pow(corr(s.ret, m.ret), 2)), 1)                                            AS unexplained_share_pct\nFROM rets AS s\nINNER JOIN (SELECT date, ret FROM rets WHERE ticker = 'SPY') AS m ON s.date = m.date\nWHERE s.ticker != 'SPY'\nGROUP BY ticker\nORDER BY total_vol_pct DESC","computed_at":"2026-10-16T15:32:32.164485+00:00","elapsed":0.004828869}