[R] Difference in Levene's test between R and SPSS

[Ravi Kulkarni]

I think I have an answer: SPSS uses absolute deviations from the _mean_ in
Levene's test.
(See calculation in 
http://www.uvm.edu/~dhowell/gradstat/psych340/Lectures/Anova/anova2.html)

R uses absolute deviations from the _median_ (R help).
So the difference.

Ravi
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