Hi Family,
I have 1 categorical variable that has 3 grps( blue,yellow, green), I wanted check if the variance between only these two groups( blue and green) differs. So how do i use if condition to constraint the categorical variable to work with only the 2 groups out of the 3.
Given that;
the value label for blue=1 yellow=2 and green=3
wait= Weight of individuals
Below is the command I used but stata still generate an error.
sdtest wait , by( grps ) if grps==1 & grps==3
option if not allowedr(198);
I need your help?
Thank you.
Amidu
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