[R] testing the multiple regression model

[dada]

Hi
I have 25 samples in my dataset. I have written a multiple regression model
and I would like to test it. 
I would like to train my model on 20 samples and then test it on 5
remaining. However I would like to test the model several times, each time
using different 5 samples out of 25 and check how well the model performs
each time. 
As I am new to R, I am not sure how the script should look like. Could you
please help me with this ? Thank you

 




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