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dups provides information about unique and duplicate observations in the
dataset and, optionally, drops all duplicate observations.
varlist is an optional variable list that determines which observations are
duplicates: observations must match exactly on all variables in the list to
be duplicates. If no varlist is given, then all variables in the dataset
are used to determine duplicates.
--On Wednesday, August 14, 2002 7:22 PM +0100 "Siyam,AA (pgr)"
> Dear Stata-users,
> I have a household roster data file which consists of about 20 variables
> measured on household members. I have my doubts that the persons_id
> within a household is not unique. Is there a way I can "mass-check" all
> 20 variables between members of the same households to determine
> duplicate records. I thought of the following:
> sort hhid persons_id
> for var V1-V20: gen DX=X[_n]==X[_n-1]
> quietly by hhid: egen DSUM=rsum( DV1. .... DV20)
> quietly by hhid: drop if DSUM[n]==20
> Does that make sense!
> Many thanks for your thoughts in advance...
> * For searches and help try:
> * http://www.stata.com/support/faqs/res/findit.html
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
Sarah Mustillo, Ph.D
Center for Developmental Epidemiology
Department of Psychiatry and Behavioral Sciences
Duke University Medical Center
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