Missing Values

An observation read from a DATA=, SUMMARY=, or TABLE= data set is not analyzed if the value of the group variable is missing. For a particular response variable, an observation read from a DATA= data set is not analyzed if the value of the response variable is missing. Missing values of response variables generally lead to unequal group sample sizes. For a particular response variable, an observation read from a SUMMARY= or TABLE= data set is not analyzed if the values of any of the corresponding summary variables are missing.