I have 13 features from 100 breast thermal images, to detect breast cancer, which are (means, standard deviation, correlation, contrast, energy, entropy, skeweness, homogeneity, variance, smoothness, KURTOSIS, RMS and IDM) and I want to use them to train Ann for classification (benign or malignant). How could I use pca to get the best features? Should I normalize the values before? And when I apply pca I get coeff and score, should I use the score as the input of my Ann or is there an equation between coeff and my features to use for my Ann? Sorry for my long question but pca is still confusing me!!!