3*6的FISH确切概率运行不出结果

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现跟各位高手请教我有个3*6的列联表，但是有几个格子的理论频数小于5，就想着用FISH确切概率法，用的是最简单的FREQ 后面家exact的语句，但是SAS运行了很久，都没有结果，不知道是怎么回事？望各位大侠指点。

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关键词：Fish fis exact freq 各位大侠 格子

In SAS, the FISHER or EXACT option must be specified in the TABLES statement in PROC FREQ to perform the Fisher’s exact test when the table has more than two rows or two columns.

1# lena0202

Like other exact statistics involving a large amount of calculation, Fisher’s exact could be very time-consuming if a bigger dimension of contingency table or larger N was involved.
Thus, it is typical for SAS not giving any result after a long time has elapsed. That is, even though the algorithm is tractable, but considering the way how SAS to compute it, you should expect that Fisher’s is not computable sometimes. You could set option MAXTIME= in PROC FREQ to stop the calculation if the time is too long.
JingJu

有时候确实是运行不出来

当然运行不出来，2楼已经说的很清楚了，Fisher只适用于2X2的表格。