Plotting a graph with its confidence interval in R

Asked Apr 06 '17 at 08:18

Active Apr 06 '17 at 13:35

Viewed 147 times

I have a model that gives me a prediction together with the error estimate.

So we have X for the time, Y for the prediction and E for the error.

I would like to plot the prediction and the confidence interval.

The image below shows the type of result I would like to achieve:

Don't bother about the vertical stripes and the dashed line.

The graph has a plot that can be made as following:

plot( X, Y, type = 'l', col='red')

Then there is a 50% confidence interval that is as follow [Y+E, Y-E]

So I could add two lines using:

lines(X, Y+E)
lines(X, Y-E)

But instead I would like to color the area between those lines (and preferably using basic R).

Is this possible? Any suggestions?

edited Apr 06 '17 at 13:35

Zheyuan Li

asked Apr 06 '17 at 08:18

benoitespinola

Plot a `polygon` or switch to `ggplot2`. – Axeman Apr 06 '17 at 08:34
As Axeman already suggested you can use `polygon` from the base package, e.g., `polygon(c(X, rev(X)), c(Y-E, rev(Y+E)))`. – ikop Apr 06 '17 at 09:26
I have searched for quite a while, maybe I did not have the proper vocabulary. But the polygon approach will do the trick. Thanks. – benoitespinola Apr 06 '17 at 10:38
Thanks for showing this other post. – benoitespinola Apr 09 '17 at 10:05

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