Dear All,
A linear regression model could be fitted by using lm function and the plot
function can be used to check the assumption of the model.
The help menu shows few instances on suitable coding for fitting such a linear
model. In addition, four different plots could be extracted simultaneously with
only a single plot function as followed:
require(graphics)
## Annette Dobson (1990) "An Introduction to Generalized Linear Models".
## Page 9: Plant Weight Data.
ctl <- c(4.17,5.58,5.18,6.11,4.50,4.61,5.17,4.53,5.33,5.14)
trt <- c(4.81,4.17,4.41,3.59,5.87,3.83,6.03,4.89,4.32,4.69)
group <- gl(2,10,20, labels=c("Ctl","Trt"))
weight <- c(ctl, trt)
anova(lm.D9 <- lm(weight ~ group))
opar <- par(mfrow = c(2,2), oma = c(0, 0, 1.1, 0))
plot(lm.D9, las = 1)
The plot function gives four different plots simulaneously but i just need only
part of them, for instance the normality plot. Could someone give some ideas
the way to extract this single plot as i need to copy only this plot and paste
it into Word document.
Thanks
Fir
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