Remove slope_snr, slope_snr_r2, james_stein score functions and r2_alpha parameter. slope_r2_score reverts to simple slope*R² with no alpha parameter. Minor docstring fix: R^2 → R².
Remove slope_snr, slope_snr_r2, james_stein score functions and r2_alpha parameter. slope_r2_score reverts to simple slope*R² with no alpha parameter. Minor docstring fix: R^2 → R².