How are ties handled by jamovi in the Wilcoxon test ?
Posted: Sun Aug 14, 2022 10:28 am
Hi jamovi users/team
I'm currently trying to understand how jamovi handles ties in the Wilcoxon test.
When running a Wilcoxon test on ordinal data with ties, jamovi displays the following message : "XX pair(s) of values were tied" with "XX" being the number of ties.
I read elsewhere in the forum (viewtopic.php?p=6750) that jamovi uses the wilcox.test() function in R to implement the test.
However, in the function's documentation (https://www.rdocumentation.org/packages ... ilcox.test), I don't really see how ties are handled.
I know that there are several ways ties are handled wen running a Wilcoxon test: the ties can be discarded, tied rankings can be divided within all same values, it is possible to order the tied observations randomly etc. How does jamovi actually handle them?
edit: In a previous thread (https://github.com/jamovi/jamovi/issues/577) I found out that in case of ties "a normal approximation is used". But I'm still not sure what this means regarding how ties are handled.
Thanks!
Clement
I'm currently trying to understand how jamovi handles ties in the Wilcoxon test.
When running a Wilcoxon test on ordinal data with ties, jamovi displays the following message : "XX pair(s) of values were tied" with "XX" being the number of ties.
I read elsewhere in the forum (viewtopic.php?p=6750) that jamovi uses the wilcox.test() function in R to implement the test.
However, in the function's documentation (https://www.rdocumentation.org/packages ... ilcox.test), I don't really see how ties are handled.
I know that there are several ways ties are handled wen running a Wilcoxon test: the ties can be discarded, tied rankings can be divided within all same values, it is possible to order the tied observations randomly etc. How does jamovi actually handle them?
edit: In a previous thread (https://github.com/jamovi/jamovi/issues/577) I found out that in case of ties "a normal approximation is used". But I'm still not sure what this means regarding how ties are handled.
Thanks!
Clement