R-squared NA for PLSR predictionReport
I am using UNSCRAMBLER X for soil spectroscopy. I was predicting some values with PLSR, but when I looked at the predicted vs. reference statistics, it showed me “NA” for the R-squared value. I was trying to find out why it doesn’t show zero or the actual value, but didn’t find any answer for it. Is there any specific threshold value below which the R-squared doesn’t get shown anymore, as the correlation coefficient was still shown, so the R-squared should be possible to calculate from that.