Hi,
For the comparison of paired samples with non-normal distributions (or ordinal data) with skewness out of the boundaries of -2 and +2 it is suggested that the sign test is used instead of the wilcoxon test.
Is there a way to perform it with jamovi?
Thanks
Sign Test for skewed, non-normal paired sample comparisons
-
- Posts: 3
- Joined: Tue Oct 26, 2021 2:58 pm
Re: Sign Test for skewed, non-normal paired sample compariso
Hey @istanbulemdoc,
in jamovi you do not find the sign test, but its versatility allows you to do it.
I'm not going to offer you some R code to use with version 2.0.1 of the Rj module (that's great), but two simple steps, which take the time of a blink of an eye.
Compute a new variable as the difference of the two of interest to create the signs you need and apply a binomial test to this new computed variable (you can find it in "Frequencies> 2 Outcomes> Binomial test".
I am attaching a screenshot as an example to give you the idea. There are two VAS "Visual Analogical Scale" ordinal variables for self-assessment of lumbar spine pain, pre and post rehabilitation treatment.
The third variable PAIN and the one computed with the decreased/increase signs as the difference between before and after used for the binomial test.
Cheers,
Maurizio
in jamovi you do not find the sign test, but its versatility allows you to do it.
I'm not going to offer you some R code to use with version 2.0.1 of the Rj module (that's great), but two simple steps, which take the time of a blink of an eye.
Compute a new variable as the difference of the two of interest to create the signs you need and apply a binomial test to this new computed variable (you can find it in "Frequencies> 2 Outcomes> Binomial test".
I am attaching a screenshot as an example to give you the idea. There are two VAS "Visual Analogical Scale" ordinal variables for self-assessment of lumbar spine pain, pre and post rehabilitation treatment.
The third variable PAIN and the one computed with the decreased/increase signs as the difference between before and after used for the binomial test.
Cheers,
Maurizio