ما معنى Kolmogorov–Smirnov test؟

The Kolmogorov–Smirnov test of the null that $X_1, \dots, X_n$ are iid with a fully specified continuous cdf $F$ uses $D_n = \sup_x|F_n(x) - F(x)|$, $F_n$ the empirical cdf. Under the null, $\P(\sqrt n\,D_n > \lambda) \to 2\sum_{k \ge 1}(-1)^{k-1}e^{-2k^2\lambda^2}$, whatever $F$; the 5% critical value is $\lambda = 1.358$.