Cumulative distribution functions used by other tests. analyze, cdf, exports, cdf.regularizedincompletebeta, x, b, number, cdf.t, df, cdf.f, df1, df2 # Analyze · CDF Cumulative distribution functions used by other tests. ## Exports - `CDF.regularizedIncompleteBeta(x, a, b): number` – Regularized incomplete beta **Iₓ(a,b)**. Clamps to `[0,1]` when `x≤0` or `x≥1`. - `CDF.t(x, df): number` – CDF of the **Student t** distribution. `df` must be positive. - `CDF.f(x, df1, df2): number` – CDF of the **F** distribution. `df1, df2` must be positive. - `CDF.phi(x): number` – Standard normal CDF **Φ(x)**. Returns `0`/`1` for large negative/positive tails and supports `±Infinity`.