| compute_eigenvalues | Compute Eigenvalues of the Covariance Matrix |
| marchenko_pastur_bounds | Marchenko–Pastur Theoretical Bounds |
| plot_sigPCA | Plot PCA Eigenvalue Spectrum with Marchenko–Pastur Bounds |
| plot_sigPCA_histogram | Plot PCA Eigenvalue Histogram with Marchenko-Pastur Bounds |
| sigPCA | Unified PCA Significance Wrapper |
| sigPCA_mp | PCA Significance Based on Marchenko–Pastur Distribution |
| sigPCA_perm | PCA Significance via Permutation Test |