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RaviSelker

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RaviSelker
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  • Interaction contrasts can be pretty complex, and we're not quite sure how to implement this in a way that is still very easy to use. So we would like to include this at some point but don't expect it any time soon.
  • Hi Matt, I checked the code that is used to create the contrast weights and there seems to be an error in the way they are created at the moment. I fixed it now, and committed the change (see, https://github.com/jasp-stats/jasp-desktop/pull/1385/co…
  • This is how we calculate skewness and kurtosis: .descriptivesKurtosis <- function(x) { # Kurtosis function as in SPSS: # http://www.ats.ucla.edu/stat/mult_pkg/faq/general/kurtosis.htm # http://en.wikipedia.org/wiki/Kurtosis#Estimators_…
  • Are you doing the analysis on the "ThreeWayRepeatANOVA.csv" data set? Because that is the one that you should use in JASP as this is in wide format. The "Ancova.csv" is in long format. If I try the analysis I assume you want to d…
  • Ah, I thought you were talking about the regular ANOVA. I'm not completely sure how SPSS produces its results so I will look into it and get back to you.
  • I see that SPSS provides t-tests and an omnibus F test which is the same as the result in the ANOVA table. As the F test is already provided in the regular ANOVA table in JASP I don't really see a reason to give the same exact result again for the c…
  • Sorry for not getting back to you sooner. I discussed it with the maintainer of the R package and it appears that the R function assumes that the variances (and thus the SE's) are equal to each other. This makes sense because one of the assumptions …
  • Hi Marie, Thanks for you response. It's definitely not possible for eta squared to be bigger than partial eta squared as SStotal will always at least include SSerror and SS. In your hand calculations you forgot to include the SSerror in SStotal, an…
  • Can you please provide an example. The only reason for them to have the same value would be if you only have one factor (as SStotal = SS + SSerror). I'm also pretty sure that the formula we use to calculate omega squared is the correct one (https://…
  • Yes, this is a bug. We already fixed it (https://github.com/jasp-stats/jasp-desktop/pull/1248) and we are going to do a small release soon to incorporate this fix.
  • We use the lsmeans package in R (in combination with the afex package) to calculate post-hoc tests for repeated measure. Here's an example of how we use it: # load packagesrequire(afex)require(lsmeans)# simulate data setset.seed(1)dataset <- dat…
  • Hi Tom, JASP only allows repeated measures data in wide format. Your data is in long format (for the difference, see http://www.theanalysisfactor.com/wide-and-long-data/), so you must reformat the data in order to use it in JASP. Subsequently, to r…