[R] SpreadLevelPlot for more than one factor

[Ashim Kapoor]

Dear All,

we need to do :

library(car) for the spreadLevelPlot function

I forgot to say that.

Apologies,
Ashim

On Sun, Jan 7, 2018 at 10:37 AM, Ashim Kapoor <ashimkapoor at gmail.com> wrote:

> 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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