pre-preatment

  1. T

    PCA pre-treatment: Centering or Standardizing?

    Hello all, I have a matrix X that contains industrial data, where each column is a variable. Since PCA is done by the correlation matrix, should I use: . original X; . X after Centering (subtracting each column of X by the mean of the respective column); .X after Standardizing? (subtracting...