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Re: st: friedman test


From   Anders Alexandersson <andersalex@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: friedman test
Date   Tue, 29 Nov 2011 11:34:45 -0500

I agree with Nick. Also, the UCLA webpage
http://www.ats.ucla.edu/stat/mult_pkg/whatstat/choosestat.html
has links to comparable SPSS and Stata (and SAS) code. See -findit
skilmack- if you want the Friedman test when data are missing.

Anders Alexandersson
andersalex@gmail.com

On Tue, Nov 29, 2011 at 11:16 AM, Nick Cox <njcoxstata@gmail.com> wrote:
> This presumably refers to Richard Goldstein's -friedman- (SJ 5-1),
> which is user-written,
>
> The help for -friedman- explains
>
> " -friedman- expects the raters to be the variables.  This is because -egen,
>    rank()- ranks observations, not variables.  This expectation differs from
>    that in some other software."
>
> I suspect that you are not comparing like with like.
>
> Nick
>
> On Tue, Nov 29, 2011 at 3:51 PM, Daniela Ferrante (Lab. Statistica)
> <daniela.ferrante@med.unipmn.it> wrote:
>>
>> I have a question about friedman test. I tried to perform the friedman test
>> with Stata, R software and SPSS but I get quite different p values with an
>> equal p value with R and SPSS but different from Stata results. I am wondering
>> why I get quite different results.
>> I attach the data:
>>
>> 0,005     0,005     0,005
>> 0,005     0,005     0,005
>> 0,005     0,005     4,47
>> 0,005     0,005     12,56
>> 0,005     0,005     0,005
>> 0,005     0,005     0,005
>> 0,1         0,2      1,46
>> 0,005     0,005     0,005
>> 0,005     0,005     0,005
>> 0,005     0,005     0,005
>> 0,005     0,005     0,005
>> 0,005     0,005     0,005
>> 0,005     0,005     0,005
>> 0,005     0,005     0,005
>> 0,005     0,005     0,005
>> 0,005     0,005     0,005
>> 0,005     0,005     0,005
>> 0,005     0,005     0,005
>> 0,005     0,005     0,005
>>
>> Using this data I obtain p=0,69 using Stata software but p=0,06 using R and
>> SPSS software
>>
>
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