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  • Freeman-Holton's extension to Fisher's Exact test in Stata

    Hi,
    Does anyone know if Stata automatically uses Freeman-Holton's Extension to Fisher's Exact test when handing contingency tables larger than 2X2? The Stata Help Menu indicates the following (see below), so it appears that Stata does use some methods to handle rxc tables. A reviewer asked if this extension was applied in our analysis in Stata. I searched online but was not sure if Stata used this method automatically when doing Fisher's Exact with rxc tables.Would appreciate your opinion. Thanks very much.
    Sincerely
    MN

    “exact[(#)] displays the significance calculated by Fisher's exact test and may be applied to r x c as well as to 2 x 2 tables. For 2 x 2 tables, both one- and two-sided probabilities are displayed. For r x c tables, two-sided probabilities are displayed. The optional positive integer # is a multiplier on the amount of memory that the command is permitted to consume. The default is 1. This option should not be necessary for reasonable r x c tables. If the command terminates with error 910, try exact(2). The maximum row or column dimension allowed when computing Fisher's exact test is the maximum row or column dimension for tabulate (see limits).”

  • #2
    I believe that Stata does not use Freeman-Holton - look at the pdf documentation and you will see that they are not cited - but Mehta and Patel are

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    • #3
      Thank you. I also read the Stata Help guide and noticed the same thing, that was why I posed the question here to check if anyone knew about it. I found the following resource online which indicates that Stata uses this extension but I was not sure about the authenticity of this source...Thanks again.
      https://www.ctspedia.org/wiki/pub/CT...2IndGroups.doc

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