How to apply the created model using PLSregress on test data?

Question

Sanaz J 2016-1-15

0
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https://ww2.mathworks.cn/matlabcentral/answers/263963-how-to-apply-the-created-model-using-plsregress-on-test-data

回答： Ali Farmanesh 2017-6-25

Hi, I am using PLSRegress for 40 spectra with 150 features vs. some chemical data associated with each spectra. I can get the R-square for the regression but I am not able to get the model that is created using my training data. I want to apply the model to my test data to predict the chemical content. Anyone can help me about applying the model on my test data? This is the code I am using for training part: [Xloadings,Yloadings,Xscores,Yscores,betaPLS] = plsregress(X_Train,Y_Train,17,'CV',10);

[n,m] = size(X_Train);

yfitPLS = [ones(n,1) X_Train]*betaPLS;

plot(Y_Train,yfitPLS,'bo');

xlabel('Mg (Ground reference)');

ylabel('Mg (Prediction)');

TSS = sum((Y_Train-mean(Y_Train)).^2);

RSS_PLS = sum((Y_Train-yfitPLS).^2);

rsquaredPLS = 1 - RSS_PLS/TSS

Now I need to apply the created model on my test data which I couldn't figure out how!

Thanks