Posted by
Anthony Babinec on
URL: http://spssx-discussion.165.s1.nabble.com/Revision-control-for-SPSS-source-code-tp4267835p4273937.html
I am running Windows 7 64-bit. I see that Dave Matheson posted something
on this.
Tony Babinec
[hidden email]
-----Original Message-----
From: SPSSX(r) Discussion [mailto:
[hidden email]] On Behalf Of
Bruce Weaver
Sent: Thursday, March 31, 2011 1:34 PM
To:
[hidden email]
Subject: Re: exact versus asymptotic p-value under normal circumstances
Sorry Tony, but I'm about to throw a spanner into the works. One of my
colleagues just started using v19, and it is not yet patched, so I asked him
to run the code. He got the same p-values I did for the two exact tests.
Exact p = .216 for Pearson
Exact p = .219 for Likelihood ratio
Cheers,
Bruce
Anthony Babinec wrote:
>
> Bruce,
> Good work. Your reported results make sense. A quick run in unpatched
> version 19 shows results that do not agree and could be suspect. Those
> are the numbers that are being reported by Bridgette. I don't have
> StatXact on the machine where I'm at, but would think that its results
> would agree with the ones your report. So, this appears to be a
> problem -- known or unknown
> -- in
> version 19.
>
>
> Tony Babinec
>
[hidden email]
>
> -----Original Message-----
> From: SPSSX(r) Discussion [mailto:
[hidden email]] On Behalf
> Of Bruce Weaver
> Sent: Thursday, March 31, 2011 10:08 AM
> To:
[hidden email]
> Subject: Re: exact versus asymptotic p-value under normal
> circumstances
>
> I just discovered that Bridgette sent some output to the Hotmail
> account I use for posting to this list. (Bridgette, as it says in my
> sig file, I only use that account for mailing to this list, and check
> it only occasionally.
> If you want to correspond off-list, please use the everyday e-mail
> address given in my sig file.)
>
> So, here is syntax to generate her table, and the tests of interest.
> Notice
> that the results I get do not match the ones she sent me.
>
> * Bridgette's data.
> data list list / row col kount (3f5.0).
> begin data
> 1 1 11
> 1 2 16
> 2 1 14
> 2 2 35
> 3 1 8
> 3 2 21
> 4 1 23
> 4 2 27
> end data.
>
> var lab
> row "Death personality"
> col "Age group"
> .
> val lab
> row 1 "Cruel"
> 2 "Gentle"
> 3 "Impassive"
> 4 "Other/variable" /
> col 1 "Under 40"
> 2 "40 plus"
> .
> weight by kount .
> crosstabs row by col / stat = chisqr.
>
> * For those who have the Exact Tests module .
>
> CROSSTABS
> /TABLES=row BY col / stat = chisqr
> /METHOD=EXACT TIMER(5).
>
> * My results (using v18 with all patches under Windoze XP Professional):
> * Pearson: Asymptotic p = .213, exact p = .216 .
> * Likelihood ratio: Asymptotic p = .212, exact p = .219 .
>
> * Output Bridgette sent me:
> * Pearson: Asymptotic p = .213, exact p = .028 .
> * Likelihood ratio: Asymptotic p = .212, exact p = .047 .
>
>
> Bridgette, what version of SPSS are you using? Have all the available
> patches been applied?
>
> Also, regarding Age Group, why group? Do you have the actual ages?
>
> Cheers,
> Bruce
>
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-----
--
Bruce Weaver
[hidden email]
http://sites.google.com/a/lakeheadu.ca/bweaver/"When all else fails, RTFM."
NOTE: My Hotmail account is not monitored regularly.
To send me an e-mail, please use the address shown above.
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