Question

13.11 Interpreting model fitting results. Five different models are fit using the same training data set, and tested on the same (separate) test set (which has the same size as the training set). The RMS prediction errors for each model, on the training and test sets, are reported below. Comment briefly on the results for each model. You might mention whether the model’s predictions are good or bad, whether it is likely to generalize to unseen data, or whether it is over-fit. You are also welcome to say that you don’t believe the results, or think the reported numbers are fishy.

Model	Train RMS	Test RMS
A	1.355	1.423
B	9.760	9.165
C	5.033	0.889
D	0.211	5.072
E	0.633	0.633

Answer 1