[R] Is there an lm() equivalent of panel.lmline()?

[Greg Snow]

You can use the lmList function in the nlme package to do several
seperate regressions, or use a model that allows for multiple
intercepts.  Possibly Xvalues ~ 0 + log(Qvalues)*Tfac or Xvalues ~ 0 +
Tfac + log(Qvalues):Tfac (assuming Tfac is a factor).

On Tue, Oct 30, 2012 at 5:53 AM, Alex van der Spek <doorz at xs4all.nl> wrote:
> panel.lmline returns intercept and slope of y ~ x subsetted to the
> combination of conditioning factors given to xyplot in lattice.
>
> for instance:
>
> xyplot(Xvalues ~ log(Qvalues)|Tfac, data = df7, panel = panel.lmline)
>
>
> I am looking to find the equivalent formulation for lm() proper. If I do
> this:
>
> lmcal <- lm(Xvalues ~ log(Qvalues):Tfac, data = df7)
>
> Only one value of the intercept is returned. It appears as all the
> 'individual' intercepts are summed to form one overall intercept.
>
> Any help much appreciated!
>
> Regards,
> Alex van der Spek
>
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-- 
Gregory (Greg) L. Snow Ph.D.
538280 at gmail.com