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
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