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O6688
Calcite | Level 5

I am wondering what procedure in SAS will provide Mann-Whitney Rank Sum test for two sample test.

Thanks,

4 REPLIES 4
Keith
Obsidian | Level 7

Proc Npar1way with the Wilcoxon option will do this for you.


Regards,

Keith

O6688
Calcite | Level 5

Thank you very much.

I did so, but the results are different from the SPSS results, which reported by Mann-Whitney Rank Sum test.

What is different between 'Normal Approximation' and ' t Approximation' for the Statistic?

If I have a small sample size (<10), should I use EXACT test?

Thank you again in advance.

A

Doc_Duke
Rhodochrosite | Level 12

The differences in approximations are in the documentation.  The approximations are for larger samples.

With a small sample the exact test is better.

Lastly, the differences with SPSS may have to do with the use of a continuity correction in the approximations.  Again, see the documentation.

Doc Muhlbaier

Duke

O6688
Calcite | Level 5

Thank you very much.

It is helpful.

A

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