Wednesday, March 15, 2006

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

wow the very author - thanks - if only I could find the program! L

Nick Cox wrote:

>-pnrcheck- from SSC covers the Swedish case. > >In this case, look _inside_ the program >for some ideas. String functions are not >the only way. -mod()- is also useful. > >The authors of -pnrcheck- are two Italians >and a Welshman, just who you would expect >to be working on Swedish identifiers. > >Nick >n.j.cox@durham.ac.uk > >Lia Orfei > > > >>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. >> >> > >* >* 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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* * 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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