R help - Jan 2021 - Different results on running Wilcoxon Rank Sum test in R and SPSS

Hello,?
On running the Wilcoxon Rank Sum test in R and SPSS, I am getting the following
discrepancies which I am unable to explain.
Q1 In the attached data set, I was trying to compare freq4w_n in those with
drug_code 0 vs 1. SPSS gives a P value 0.031 vs R gives a P value 0.001779.?
The code I used in R is as follows -?
wilcox.test(freq4w_n, drug_code, conf.int = T)


Q2 Similarly, in the same data set, when trying to compare PFD_n in those with
drug_code 0 vs 1, SPSS gives a P value 0.038 vs R gives a P value?< 2.2e-16.?
The code I used in R is as follows -?
wilcox.test(PFD_n, drug_code, mu = 0, alternative = "two.sided",
correct = TRUE, paired = FALSE, conf.int = TRUE)


I have tried searching on Google and watching some Youtube tutorials, I cannot
find an answer, Any help will be really appreciated, Thank you!?

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On 18/01/2021 17:26, bharat rawlley via R-help wrote:
> Hello,
> On running the Wilcoxon Rank Sum test in R and SPSS, I am getting the
following discrepancies which I am unable to explain.
> Q1 In the attached data set, I was trying to compare freq4w_n in those with
drug_code 0 vs 1. SPSS gives a P value 0.031 vs R gives a P value 0.001779.
> The code I used in R is as follows -
> wilcox.test(freq4w_n, drug_code, conf.int = T)
> 
> 
> Q2 Similarly, in the same data set, when trying to compare PFD_n in those
with drug_code 0 vs 1, SPSS gives a P value 0.038 vs R gives a P value?<
2.2e-16.
> The code I used in R is as follows -
> wilcox.test(PFD_n, drug_code, mu = 0, alternative = "two.sided",
correct = TRUE, paired = FALSE, conf.int = TRUE)
> 
> 
> I have tried searching on Google and watching some Youtube tutorials, I
cannot find an answer, Any help will be really appreciated, Thank you!
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
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> 
-- 
Michael
http://www.dewey.myzen.co.uk/home.html