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

[Lia Orfei <lorfei@sgul.ac.uk>]

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
>
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