when comparing multiple variables in stata does the missing value mean how to compare two variables in stata why is it possible to use the variable correlation between groups what variables do correlations compare? why are there missing values in stata? what do you mean when using correlate why does stata say no observations why does statistica use correlation what is the missing value in statistica what is the missing value in income variable how do i use correlate to compare data why does stata say no observations in the regression how to compare the income of a variable how to compare two data variables in stata when you try to compare income within a variable, you get what error how to compare in stata when using correlate in stata do you get the error that says no observations? why do i get an error when i try to perform correlate in stata where does correlation fail how to compare a subgroup of a variable