I am using a census dataset which has these following variables:
county industry income
I know how to calculate the normal one: collapse (p90) income, by(county industry).

How do I calculate a leave-out 90th percentile income by industry? Suppose there are 3 counties (i=1,2,3) and 3 industries (j=1,2,3). For county i=1 and industry j=1, I would like to get the 90th percentile income of people in industry j=1 and in counties i=2 and 3.

Thanks a lot in advance!