cross-validate fitlm

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Toby Feld 2021-5-8

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https://ww2.mathworks.cn/matlabcentral/answers/825195-cross-validate-fitlm

Hello,

I would like to use fitlm to also take non-linear relationships into account.

I have X1 which is a 100 x 3 matrix, predictive variables (for training). X2 is a 50 x 3 matrix, predictive variables (for testing). I have Y1 which is a 100 x 1 matrix, predicted variable (for training). Y2 is a 50 x 1 matrix, predicted variable (for testing).

lm = fitlm(X1,Y1,'quadratic');

This gives me a very complex variable, a "1x1 linear model".

Now how can I use the model lm to cross-validate? I can see that there are estimated coefficients, but there are also coefficients for interactions (e.g., "x1:x2"). I am not sure how to do this, but I want something like "testlm(X2,Y2,'quadratic')".

Thanks,

Tim