Hi R user,
I am just wondering how I can add Standard error bar in the interaction plot. I
used the following code but I don't know how i can edit this to put a started
error's bar on the mean.
Would you give me some hints? or do other packages provide the information
about plotting the SE bar for interaction.plot?
require(graphics)
with(OrchardSprays, {
interaction.plot(treatment, rowpos, decrease)
interaction.plot(rowpos, treatment, decrease, cex.axis = 0.8)
## order the rows by their mean effect
rowpos <- factor(rowpos,
levels = sort.list(tapply(decrease, rowpos, mean)))
interaction.plot(rowpos, treatment, decrease, col = 2:9, lty = 1)
})
thanks
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