Question

what is meant by rhe phrase "Check for restricted range on both predictor and criterion?

Answer 1

A restricted range is a range of values that has been condensed, or shortened. For example, the entire range of G.P.A. scores is 0 to 4.0. A restricted range could be 3.0 to 4.0, or 2.0 to 3.0

In the field of statistics, restricting the range means to limit the data in the population to some criterion, or use a subset of data to determine whether two pieces of information are correlated, or connected.

In statistical modeling, the predictor variable is analogous to an independent variable and is used to predict an outcome (the criterion variable). One of the main differences between independent/dependent and criterion/predictor variables is the concept of causation

Restriction of range is the term applied to the case in which observed sample data are not available across the entire range of interest. The most common case is that of a bivariate correlation between two normally distributed variables, one of which has a range less than that commonly observed in the population as a whole. In such cases the observed correlation in the range restricted sample will be attenuated (lower) than it would be if data from the entire possible range were analyzed.

The context in which restriction of range is discussed most often is that of criterion-related validity evidence of predictors in a selection context such as employee selection or educational institution admissions.