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st: Ksmirnov discrete data (again)


From   Robert �stling <[email protected]>
To   [email protected]
Subject   st: Ksmirnov discrete data (again)
Date   Fri, 15 Jun 2007 12:07:15 +0200

I would like to do a K-S test with discrete data using ksmirnov. I have read previous posts on the list (the latest being http://www.stata.com/statalist/archive/2007-05/msg00489.html), but I can't figure out if the problem has been fixed. I understand that the easy solution implies conservative p values. The latest version is from 21 May 2007, but when I use it with discrete data it reports that there are ties in the data. Can I use it nevertheless (being aware that the results are conservative)?

The output currently looks as follows:

. ksmirnov guess, by(chosen)

Two-sample Kolmogorov-Smirnov test for equality of distribution functions:

 Smaller group       D       P-value  Corrected
 ----------------------------------------------
 0:                  0.0340    0.070
 1:                 -0.0261    0.209
 Combined K-S:       0.0340    0.140      0.132

Note: ties exist in combined dataset;
      there are 74 unique values out of 5586 observations.

Does this mean that the problem wasn't fixed and that only a warning message has been added in the new version? ;-) The result is exactly the same as with the old version of ksmirnov.

Robert Ostling (new on the list)

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