A single beta hides the thing that actually hurts: many stocks are far more sensitive to the market on the way down than on the way up. Quantora splits beta into up-market and down-market halves, tracks how beta drifts over time, and shows the CAPM alpha left over - so you see the real risk profile, not one averaged number.
Beta is the slope of the stock's daily returns regressed on the S&P 500 (SPY). Up-market beta uses only days SPY rose; down-market beta uses only days SPY fell. Rolling beta uses a 63-trading-day window. CAPM alpha is the annualized average return not explained by market exposure (risk-free rate ignored, so it is an approximation). Based on daily returns over roughly five years. Educational only - not investment advice.