1. M

    Why autoscale (mean centre and divide by SD) before PLS-DA on integer data?

    I'm currently working with a large dataset of integer data. I'm performing a variable stabilisation transformation on this data and then autoscaling before I begin working with PLS-DA and VIP. Can anyone explain to me why I've had to do this and how it's affecting my data? As I'm unclear myself...
  2. 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...