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7 months ago
program define dropmissing
syntax varlist [, missing(string) delete]
tokenize `varlist'
local nbitems:word count `varlist'
if "`missing'"=="" {
local missing="."
}
local nbmissing:word count `missing'
forvalues i=1/`nbitems' {
forvalues j=1/`nbmissing' {
local miss:word `j' of `missing'
if "`delete'"!="" {
drop if ``i''==`miss'
}
else {
replace ``i'=. if ``i''==`miss'
}
}
}
end