[R] SpreadLevelPlot for more than one factor

[Fox, John]

Dear Ashim,

Try spreadLevelPlot(breaks ~ interaction(tension, wool), data=warpbreaks) .

I hope this helps,
 John

-----------------------------
John Fox, Professor Emeritus
McMaster University
Hamilton, Ontario, Canada
Web: socialsciences.mcmaster.ca/jfox/



> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Ashim
> Kapoor
> Sent: Sunday, January 7, 2018 12:08 AM
> To: r-help at r-project.org
> Subject: [R] SpreadLevelPlot for more than one factor
> 
> Dear All,
> 
> I want a transformation which will make the spread of the response at  all
> combinations of  2 factors the same.
> 
> See for example :
> 
> boxplot(breaks ~ tension * wool, warpbreaks)
> 
> The closest I  can do is :
> 
> spreadLevelPlot(breaks ~tension , warpbreaks) spreadLevelPlot(breaks ~ wool ,
> warpbreaks)
> 
> I want to do :
> 
> spreadLevelPlot(breaks ~tension * wool, warpbreaks)
> 
> But I get :
> 
> > spreadLevelPlot(breaks ~tension * wool , warpbreaks)
> Error in spreadLevelPlot.formula(breaks ~ tension * wool, warpbreaks) :
>   right-hand side of model has more than one variable
> 
> What is the corresponding appropriate function for 2 factors ?
> 
> Many thanks,
> Ashim
> 
> 	[[alternative HTML version deleted]]
> 
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