The Beta Calculator computes a stock's beta by comparing historical company returns with market returns. It calculates the sample covariance between company and market returns divided by the sample variance of market returns (β = Cov(R_company, R_market) / Var(R_market)). The calculator checks input lengths and removes leading/trailing NaNs. Choose an appropriate return frequency and time window for meaningful results. Designed for research and educational use only — not financial advice.

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