Thank you Nick for suggesting this nice solution to my problem. For those
interested the alternative to my previous posting is:
*=====================================
u ctypes, clear
drop *_*
egen cmiss = rmiss(c?)
gen cpresent = 3 - cmiss
tab cpresent cmixtures
drop cmixtures-cpresent
reshape long c, i(id plot)
drop if area == .
drop if id == .
drop if c == .
su
bysort id plot : gen Area = area / _N
tabstat Area, by(c) s(sum)
*======================================
Best regards,
Adama
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