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Talk:SEDOLs: Difference between revisions
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Does anyone else think the last modulo isn't needed? I asked on the WP talk page for SEDOL, but no one answered. The formula is given there as: (10 − (weighted sum modulo 10)) modulo 10. (10 − (weighted sum modulo 10)) should already be less than 10 and positive so another mod 10 wouldn't do anything right? --[[User:Mwn3d|Mwn3d]] 13:28, 11 November 2009 (UTC)
:I've tried it both ways and got the same output for several inputs. Does anyone else have an opinion? --[[User:Mwn3d|Mwn3d]] 20:29, 3 February 2010 (UTC)
:See my '0' checksum comment above. x mod 10 is in the range 0..9, so 10-(x mod 10) is in the range 1..10. The extra mod brings it back into the 0..9 range. We should have add a test case which exercises this. --[[User:IanOsgood|IanOsgood]] 21:09, 3 February 2010 (UTC)
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