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Do not trust in computers [Bioanalytics]

posted by Helmut Homepage - Vienna, Austria, 2009-01-21 13:00  - Posting: # 3091
Views: 16,669

Dear DLabes!

» flame warin' a little bit with you.

Yeah, I like that!

» By the way, M$-Excel is an extraordinary software in this way.

Definitely. If one has to use it for any reasons, he/she should follow the Ohlbe's suggestions.
BTW, even in M$-Excel it's possible to get the correct answer (if STDEV() is avoided):
    |       A       |       B
    +---------------+-----------------------------
  1 | 90000001      | =(A1-A$4)^2
  2 | 90000002      | =(A2-A$4)^2
  3 | 90000003      | =(A3-A$4)^2
  4 | =MEAN(A1:A3)  | =SUM(B1:B3)
  5 | =STDEV(A1:A3) | =SQRT(1/(COUNT(A1:A3)-1)*B4)

gives
    |       A       |       B
    +---------------+-----------------------------
  1 | 90000001      | 1
  2 | 90000002      | 0
  3 | 90000003      | 1
  4 | 90000002      | 2
  5 | 0             | 1


There are even better speadsheets around. OpenOffice Calc returns 1 if STDEV() is used, even with the oldest version I have on one of my machines, namely v2.0 from 2005.

Cheers,
Helmut Schütz
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