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

 From Lia Orfei To statalist@hsphsun2.harvard.edu Subject Re: st: RE: summing up digits and comparing to a check digit Date Wed, 15 Mar 2006 15:35:54 +0000

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.

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