if traindescr is zero traindescr how to do standard deviation in r where is the standard deviation error in traindescr in r what is the standard deviation for traindescr how to find standard deviation in r what is the standard deviation for train what is cor sd error in train what is the standard deviation in train what is the error in cor(traindescr)? where is the error when r sd is zero? cor standard deviation error is zero what is the standard deviation in the train curve used in r what is train d can you run traindecr in r what is cor standard deviation for r what is the standard deviation error in r when a standard deviation is zero in train what is standard deviation error in r what is the error in cor - sd error cor is the standard deviation error