Comments on: Wilcoxon Test in R https://www.datanovia.com/en/lessons/wilcoxon-test-in-r/ Data Mining and Statistics for Decision Support Sun, 01 Sep 2024 05:34:55 +0000 hourly 1 https://wordpress.org/?v=6.8.2 By: Adrienne https://www.datanovia.com/en/lessons/wilcoxon-test-in-r/#comment-29236 Sun, 01 Sep 2024 05:34:55 +0000 https://www.datanovia.com/en/?post_type=dt_lessons&p=10866#comment-29236 In reply to Julie.

yes, this!
It would be a relief to know that it was finding the correct pairs through the analysis.

]]> By: Julie https://www.datanovia.com/en/lessons/wilcoxon-test-in-r/#comment-28969 Tue, 07 Nov 2023 11:38:01 +0000 https://www.datanovia.com/en/?post_type=dt_lessons&p=10866#comment-28969 I know that the pairing is done between the first x and y pair, however, we often have long data formats that are not necessarily ordered in a way that this pairing makes sense. Could I include ID in the analysis to ensure the pairings are made correctly without too much manual work on the data frame?

Many thanks for considering my request.

]]> By: Ruth https://www.datanovia.com/en/lessons/wilcoxon-test-in-r/#comment-22318 Thu, 30 Sep 2021 08:31:47 +0000 https://www.datanovia.com/en/?post_type=dt_lessons&p=10866#comment-22318 Hi,
thank you for this tutorial
I’m a bit confused since the title and subtitles talk about mean comparison but everywhere else inside the tutorial it seems that these tests are used for median comparison. Could this be fixed or explained?
Thanks!

]]> By: Adrian https://www.datanovia.com/en/lessons/wilcoxon-test-in-r/#comment-22288 Wed, 01 Sep 2021 18:17:55 +0000 https://www.datanovia.com/en/?post_type=dt_lessons&p=10866#comment-22288 It’s worth mentioning, that the stochastic equivalence is a general term and isn’t limited only to the shift in location. You may have perfectly equal medians and it will reject H0 if the dispersions vary. That’s why it’s not a test of medians, but rather pseudo medians, which approach medians, as the data get symmetric and have equal dispersion. You mention the pseudomedians, that’s very good! I write it just because many, many people treat the MW(W) test as a test of medians (or median difference), which *approximates* it only in a certain, special and quite rare case. As the famous article says (can be googled in seconds): “Mann-Whitney fails as a test of medians”. Same about the Kruskal-Wallis or Friedman.

]]> By: Lennard Jer https://www.datanovia.com/en/lessons/wilcoxon-test-in-r/#comment-22252 Fri, 20 Aug 2021 12:23:23 +0000 https://www.datanovia.com/en/?post_type=dt_lessons&p=10866#comment-22252 In reply to Jan Pecháček.

Thank you !!
I wrote following and it works perfectly!
Wilc_Mean % rstatix::wilcox_test(Mean_HOR ~ Mean_MYG, paired = TRUE)

]]> By: GPC https://www.datanovia.com/en/lessons/wilcoxon-test-in-r/#comment-22148 Mon, 05 Jul 2021 16:59:55 +0000 https://www.datanovia.com/en/?post_type=dt_lessons&p=10866#comment-22148 No assumptions check for the standard Wilcoxon one?

]]> By: Jan Pecháček https://www.datanovia.com/en/lessons/wilcoxon-test-in-r/#comment-21417 Thu, 17 Dec 2020 09:43:06 +0000 https://www.datanovia.com/en/?post_type=dt_lessons&p=10866#comment-21417 In reply to Jack.

Thank you!!!! Now it wokrs

]]> By: Jack https://www.datanovia.com/en/lessons/wilcoxon-test-in-r/#comment-21412 Mon, 14 Dec 2020 00:15:24 +0000 https://www.datanovia.com/en/?post_type=dt_lessons&p=10866#comment-21412 In reply to Johanna W.

I solved it today. I think there might be other packages in conflict so you can work around it by specifying the rstatix package:

rstatix::wilcox_test()

]]> By: Jack Sharples https://www.datanovia.com/en/lessons/wilcoxon-test-in-r/#comment-21408 Sun, 13 Dec 2020 20:48:42 +0000 https://www.datanovia.com/en/?post_type=dt_lessons&p=10866#comment-21408 In reply to Johanna W.

I’m getting this error now even though it was working for me this morning. what gives?

]]> By: Anne Mari https://www.datanovia.com/en/lessons/wilcoxon-test-in-r/#comment-21378 Wed, 02 Dec 2020 14:33:25 +0000 https://www.datanovia.com/en/?post_type=dt_lessons&p=10866#comment-21378 Hello. I tried the Wilcoxon signed rank test on paired samples as described here, and by using GraphPad Prism. I do not get the same result. How does the wilcox_test deal with cases where there has been no change from before to after? And how does it handle zero’s? For exampled that you looked at the relative abundance of some bacteria in 30 people before and after some treatment. But then you have a couple of people that did not change at all, or you have some people that had 0 abundance before and still 0 abundance after. Thanks

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