cd5aba6d_Feature_Index___JMP__Definition
[Term] pure error Analyze > Fit Model > Personality:Standard Least Square > Lack of Fit > Pure Error [Definition] 
The error variance estimate for exact replicates is called pure error because it is independent of whether the model is right or wrong. It represents the best that can be done in fitting these terms to the model for this data. Example Script (JSL)
Feature Index | JMP
Definition