Adjusted R2R^2R2 for a model with R2=0.80R^2=0.80R2=0.80, n=50n=50n=50, p=4p=4p=4 predictors is:
≈0.779\approx 0.779≈0.779
0.8000.8000.800
≈0.756\approx 0.756≈0.756
≈0.820\approx 0.820≈0.820