how many error samples in a sample for cross validation which error measure should be used as benchmark? why use error measures for a regression model how is the error measure used to calculate the variance how to compute an error measure in multivariate categorical model why use x-scale error in cross validation how to determine the error for a multivariate categorical model what is the best way to measure a sample's quality? how to calculate error in a multivariate model what is error measures in cross validation how to use the error measure in a multivariate model why is it necessary to compute the error measures for a data sample? how to compute error in multivariate models how to determine the quality of a multivariate model why use error measurement when calculating the error measure, which of the following should be used as benchmark? how to compute error measure what is the error measure of a population? what is the __________ error measure? what is meant by the term sampling with error?