[R] Levene test of homogeneity of variance

[JRG]

On 13 Aug 03, at 11:26, Harold Doran wrote:

> I believe it is in the Rcmdr package, which requires the car library to be loaded. 
> 
> You can also perform an ANOVA using the absolute value of the deviations from each respective group mean, which is what Levene's Test does.
> 

The function just posted by John Fox (and originally by Brian Ripley) is a much better idea.  In particular, using absolute 
deviations from the group means is a poor idea, as the performance of the resulting test is strongly dependent on population 
shape.  A good reference is

Carroll, R. J. & Schneider H., Statistics & Probability Letters, 1985, 3, 191-194.

---JRG



>  
> ------
> Harold C. Doran
> Director of Research and Evaluation
> New American Schools
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> 
> -----Original Message-----
> From: Haynes, Maurice (NIH/NICHD) [mailto:haynesm at cfr.nichd.nih.gov]
> Sent: Wednesday, August 13, 2003 10:40 AM
> To: 'r-help'
> Subject: [R] Levene test of homogeneity of variance
> 
> 
> Has the Levene test of homogeneity of variance been implemented in any
> library in R?
> 
> Thanks,
> 
> Maurice Haynes
> National Institute of Child Health and Human Development
> Child and Family Research Section
> 6705 Rockledge Drive
> Bethesda, MD  20892
> Voice: 301-496-8180
> Fax: 301-496-2766
> E-Mail: mh192j at nih.gov
> 
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John R. Gleason

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