[R] Drawing the regression line and the 95% confidence intervals
varinsacha at yahoo.fr
Wed May 6 20:59:32 CEST 2015
I really thank you lots, it perfectly works !
The reproducible example is below.
Last thing : I can easily get the predictions intervals but I don't get to draw them.
If I want to draw on the same graph (the one I already have the confidence intervals) the prediction intervals. I have tried the abline function without success. How can I do ?
LinearModel.1=lm(GDP.per.head ~ Quality.score + Competitivness.score)
predict(LinearModel.1, interval = "prediction")
Many thanks once more for your help.
----- Mail original -----
De : Jim Lemon <drjimlemon at gmail.com>
À : varin sacha <varinsacha at yahoo.fr>
Cc : R-help Mailing List <r-help at r-project.org>
Envoyé le : Mercredi 6 mai 2015 1h02
Objet : Re: [R] Drawing the regression line and the 95% confidence intervals
The line you have requested is off the plot. The following will
produce what I think you are asking, but I cannot speak for whether it
means anything sensible.
On Wed, May 6, 2015 at 8:01 AM, varin sacha <varinsacha at yahoo.fr> wrote:
> Hi, Dear R-helpers,
> Here below you will find a reproducible fictitious example working except the "abline" function.
> First thing : I try to draw the regression line (multiple linear regression). I try the "abline" function but it does not work. I don't get any error message but the straight line does not appear on the scatterplot.
> Second thing : I try to draw the 95% confidence intervals on the regression line. How could I do ?
> Using abline(0,1), I can of course add a line 45 degrees angle passing through the origin (intercept=0 and slope=1), but it is not what I am looking for.
> LinearModel.1=lm(GDP.per.head ~ Quality.score + Competitivness.score)
> plot(GDP.per.head, fitted(LinearModel.1))
> abline(GDP.per.head, fitted(LinearModel.1))
> Thanks for your help. Looking forward to reading you.
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