### Wednesday, March 15, 2006

## Re: st: Re: summing up digits and comparing to a check digit

ups...typo! The second example was supposed to be 1050457 sorry. Thanks a lot Lia

Michael Blasnik wrote:

> I'm not sure I understand the problem -- one of your examples is an 8 > digit number but you say you have 7 digit numbers. Anyway, here is > some "highly advanced programming" (?) : > > gen x=string(myvar) > replace x="0"+x if length(x)==6 > gen > check=mod(real(substr(x,2,1))+real(substr(x,3,1))+real(substr(x,4,1))+real(substr(x,5,1))+real(substr(x,6,1))+real(substr(x,7,1)),10) > > > make sure to remove any line break that the email puts in the last line. > > Michael Blasnik > > ----- Original Message ----- From: "Lia Orfei" <lorfei@sgul.ac.uk> > To: <statalist@hsphsun2.harvard.edu> > Sent: Wednesday, March 15, 2006 9:54 AM > Subject: st: summing up digits and comparing to a check digit > > >> Dear all, >> Here is a highly advanced programming challenge for you (!) >> >> I have a variable that contains 7-digit numbers; the first digit is >> the remainder of the sum of the last six digits divided by 10 (check >> digit) >> >> example: 1030332 => 0+3+0+3+3+2=11/10=1+1 => check digit=1 >> 12050457 => 0+5+0+4+5+7=21/10=2+1 => check digit=1 >> and so on. >> >> Now I want to assess whther the check digit is correct for each entry. >> >> How do I calculate the partial sum of the contents of this variable? >> >> Extra challenge: some of the numbers sum up to 10, 20 etc so the >> check digit is actually 0 and it does not appear in the data for some >> reason (example 50456 is correct becasue 5+0+4+5+6=20 so the >> remainder is 0). >> >> Any ideas?? I was thinking about using the string functions. >> >> Thanks a lot >> >> Lia > > > * > * 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/ >

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