Kurtosis in JASP - proper or excess value?
For the kurtosis statistic reported under descriptives in JASP, is this the proper kurtosis value or the excess kurtosis (i.e. proper kurtosis -3) as it is in SPSS?
Thanks
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This should be easy to figure out with generated data (for instance using the Distribution module). But perhaps we should clarify this. I'll ask the team.
It's the same as in SPSS. See https://en.wikipedia.org/wiki/Kurtosis#Standard_unbiased_estimator for the computation, and https://github.com/jasp-stats/jaspDescriptives/blob/9da9bbfe8da95dbe70b3c3cfe5340e0369cc966d/R/descriptives.R#L1509-L1525 for the R code.