In response to Joseph's question:
> I have had trouble running a series of simple exact tests. Whenever my
> tables go beyond 2x2 to tables such as the example below, STATA grinds to a
> virtual halt. I waited a half hour before pressing the "break" button.
>
> tab score arm, exact
>
> | Intervention
> Score | Lifestyle Education | Total
> -----------+----------------------+----------
> 0 | 38 54 | 92
> 1 | 73 73 | 146
> 2 | 56 58 | 114
> 3 | 29 37 | 66
> 4 | 21 20 | 41
> 5 | 6 3 | 9
> 6 | 3 3 | 6
> -----------+----------------------+----------
>
>
> This is as far as STATA gets before it seems to stop.
>
This problem will run instanteously if we input a 2 x 7 table
. profiler clear
. tabi 38 73 56 29 21 6 3 \ 54 73 58 37 20 3 3, exact
| col
row | 1 2 3 4 5 6 7 | Total
-----------+-----------------------------------------------------------------------------+----------
1 | 38 73 56 29 21 6 3 | 226
2 | 54 73 58 37 20 3 3 | 248
-----------+-----------------------------------------------------------------------------+----------
Total | 92 146 114 66 41 9 6 | 474
Fisher's exact = 0.707
. profiler off
. profiler report
Overall total count = 0
Overall total time = 0.000 (sec)
I am the developer that implemented Mehta and Patel's fexact algorithm for the
latest (Oct 5) executable update and I have evidently over looked something,
which I am hastily trying to figure out. In the mean time, use tables with the
number of columns greater than the number of rows.
Thank you for bringing this problem to my attention.
-Rich
[email protected]
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> Message-ID: <[email protected]>
> From: "Wagner, Joseph" <[email protected]>
> To: "'STATAList'" <[email protected]>
> Subject: st: Slow STATA
> Date: Mon, 11 Oct 2004 16:26:17 -0400
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>
> I have had trouble running a series of simple exact tests. Whenever my
> tables go beyond 2x2 to tables such as the example below, STATA grinds to a
> virtual halt. I waited a half hour before pressing the "break" button.
>
> tab score arm, exact
>
> | Intervention
> Score | Lifestyle Education | Total
> -----------+----------------------+----------
> 0 | 38 54 | 92
> 1 | 73 73 | 146
> 2 | 56 58 | 114
> 3 | 29 37 | 66
> 4 | 21 20 | 41
> 5 | 6 3 | 9
> 6 | 3 3 | 6
> -----------+----------------------+----------
> Total | 226 248 | 474
>
>
> This is as far as STATA gets before it seems to stop.
>
> I am using STATA v8.2, on a PIII PC with 512mb of RAM running XP
> Professional.
> *
> * For searches and help try:
> * http://www.stata.com/support/faqs/res/findit.html
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
> From [email protected] Mon Oct 11 15:31:25 2004
> Received: from gateway.stata.com (gateway.stata.com [64.241.108.3])
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> Message-ID: <[email protected]>
> From: "Wagner, Joseph" <[email protected]>
> To: "'STATAList'" <[email protected]>
> Subject: st: Slow STATA
> Date: Mon, 11 Oct 2004 16:26:17 -0400
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>
> I have had trouble running a series of simple exact tests. Whenever my
> tables go beyond 2x2 to tables such as the example below, STATA grinds to a
> virtual halt. I waited a half hour before pressing the "break" button.
>
> tab score arm, exact
>
> | Intervention
> Score | Lifestyle Education | Total
> -----------+----------------------+----------
> 0 | 38 54 | 92
> 1 | 73 73 | 146
> 2 | 56 58 | 114
> 3 | 29 37 | 66
> 4 | 21 20 | 41
> 5 | 6 3 | 9
> 6 | 3 3 | 6
> -----------+----------------------+----------
> Total | 226 248 | 474
>
>
> This is as far as STATA gets before it seems to stop.
>
> I am using STATA v8.2, on a PIII PC with 512mb of RAM running XP
> Professional.
> *
> * For searches and help try:
> * http://www.stata.com/support/faqs/res/findit.html
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
> From [email protected] Mon Oct 11 15:31:25 2004
> Received: from gateway.stata.com (gateway.stata.com [64.241.108.3])
> by dimebox.stata.com (8.12.8/8.12.8) with ESMTP id i9BKVFda011006;
> Mon, 11 Oct 2004 15:31:25 -0500
> Received: (from root@localhost)
> by gateway.stata.com (8.11.6/8.11.6) id i9BKQFY28646;
> Mon, 11 Oct 2004 15:26:15 -0500
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> Message-ID: <[email protected]>
> From: "Wagner, Joseph" <[email protected]>
> To: "'STATAList'" <[email protected]>
> Subject: st: Slow STATA
> Date: Mon, 11 Oct 2004 16:26:17 -0400
> MIME-Version: 1.0
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>
> I have had trouble running a series of simple exact tests. Whenever my
> tables go beyond 2x2 to tables such as the example below, STATA grinds to a
> virtual halt. I waited a half hour before pressing the "break" button.
>
> tab score arm, exact
>
> | Intervention
> Score | Lifestyle Education | Total
> -----------+----------------------+----------
> 0 | 38 54 | 92
> 1 | 73 73 | 146
> 2 | 56 58 | 114
> 3 | 29 37 | 66
> 4 | 21 20 | 41
> 5 | 6 3 | 9
> 6 | 3 3 | 6
> -----------+----------------------+----------
> Total | 226 248 | 474
>
>
> This is as far as STATA gets before it seems to stop.
>
> I am using STATA v8.2, on a PIII PC with 512mb of RAM running XP
> Professional.
> *
> * For searches and help try:
> * http://www.stata.com/support/faqs/res/findit.html
> * http://www.stata.com/support/statalist/faq
> * http://www.ats.ucla.edu/stat/stata/
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/
