Good day
Does SPSS Casewise diagnostics produce the variables which are a chosen standard deviation from the mean? Or are these standard deviations calculated based on another item?
I read an Journal article regarding outlier detection which states that the method of using the standard deviation around the mean method is incorrect, and that the absolute deviation around median is a much better outlier detection method . I think that the casewise diagnostics method in SPSS uses the mean method but I am not sure.
Reference
Leys, C., et al., Detecting outliers: Do not use standard deviation around the mean, use absolute deviation around the median, Journal of Experimental Social Psychology (2013), http://dx.doi.org/10.1016/j.jesp.2013.03.013
A post I made earlier today seems to have vanished, so I'll re-post the info.
The same question has been posted to the SPSSX-L forum (link below)Interested readers may want to keep an eye on that thread as well.
- http://spssx-discussion.1045642.n5.nabble.com/Casewise-Diagnostics-td5737174.html
There are about 100 methods to compute outliers if I remember correctly. One way is to look at the result of box plot.
- Badges
- Science topic
- Similar topics
- Psychology
- Social Psychology