P-value using ranksum function

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Matlab
Matlab 2017-7-23
评论： Star Strider 2017-7-24
I want to use ranksum function to the following data in A1 but p value appear NAN why?

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回答（1 个）

Star Strider
Star Strider 2017-7-23
All your values in the ‘A1.xls’ file are zero.
That will be a problem for ranksum.
D = xlsread('Matlab A1.xls');
Dmin = min(D)
Dmax = max(D)
Dinf = D(~isfinite(D))
Dmin =
0 0 0 0 0 0
Dmax =
0 0 0 0 0 0
Dinf =
0×1 empty double column vector
  2 个评论
Matlab
Matlab 2017-7-24
What do you mean that is a problem in ranksum ? And how can I solve this problem? All values equal to zero so p value must be 1.
Star Strider
Star Strider 2017-7-24
Please read the documentation on the ranksum function, and consult a statistics textbook on the Wilcoxon rank sum test.

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