getting very high MSE and an R almost equal to 1!!

I am trying to model PV output power based on 6 parameters (components of solar irradiance, ambient temperature, wind speed, wind direction, timestamp). I have used the nftool but I have noticed that the values of MSE for training, validation and testing are very high, while R are always almost equal to one , as shown in the picture attached. Do you think I should change MSE parameters to normalized percent ? or something else to get better performance with accurate results..

Answer 1

[Greg Heath]

Your R looks pretty good. Therefore your MSE is relatively low compared to the average target variance because

 R = sqrt( 1 - MSE/mean(var(t',1)) )

Thank you for accepting my answer

Greg

[Med Aymane Ahajjam]

Thank you Greg for your answer.. I was wondering if I should compute another performance parameter more relative to this problem? any suggestions?

[Greg Heath]

Yes.

Define a performance parameter that is more relative to the problem.

Then calculate it and post it.

Greg