[Rd] problem with abine(lm(...)) for plot(y~x, log='xy')
peter dalgaard
pdalgd at gmail.com
Sun Aug 7 21:21:22 CEST 2016
Try log10()...
-pd
> On 07 Aug 2016, at 21:03 , Spencer Graves <spencer.graves at prodsyse.com> wrote:
>
> Hello:
>
>
> In the following plot, the fitted line plots 100 percent above the points:
>
>
> tstDat <- data.frame(x=10^(1:3), y=10^(1:3+.1*rnorm(3)))
> tstFit <- lm(log(y)~log(x), tstDat)
> plot(y~x, tstDat, log='xy')
> abline(tstFit)
>
>
> I can get the correct line with the following:
>
>
> tstPredDat <- data.frame(x=10^seq(1, 3, len=2))
> tstPred <- predict(tstFit, tstPredDat)
> lines(tstPredDat$x, exp(tstPred))
>
>
> I tried "abline(tstFit)" hoping it would work. If the error had not been so obvious, I might not have noticed it.
>
>
> Thanks for your work to build a better R (and through that a better world).
>
>
> Spencer Graves
>
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--
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
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Email: pd.mes at cbs.dk Priv: PDalgd at gmail.com
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