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program define nbmiss
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version 8.0
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syntax varlist(min=1) [, nbmiss(string)]
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if "`nbmiss'"=="" {
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local nbmiss nbmiss
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}
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local nbitems:word count `varlist'
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tokenize `varlist'
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qui gen `nbmiss'=0
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forvalues i=1/`nbitems' {
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qui replace `nbmiss'=`nbmiss'+1 if ``i''==.
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}
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end
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