Message-ID: <vetmevcnuhim07bsljk746lk1soc4ufhg3@4ax.com>
Date: 2003-06-14T19:33:06Z
From: Duncan Murdoch
Subject: Confidence intervals plot
In-Reply-To: <003401c332a4$f4e109c0$7924ca51@statw1c2z9batg>
On Sat, 14 Jun 2003 20:44:09 +0200, you wrote:
>Hi all!!
>
>I am trying to plot several confidence intervals in a unique plot. That is, for each x, I have a confidence interval for a parameter related to x and I would like to plot them in the same plot, in order to compare them. The plot would look like some parallel vertical lines, each one corresponding to a x value. Their extrem points would be the confidence interval limits.
>I do not know if I am clear enough. Anyway, thank you in advance.
Suppose the upper limits are in U, the lower limits in L, and the x
values in X. Then
# set up the axes etc.
plot(X, U, ylim=range(c(L,U)), type='n')
segments(X, L, X, U)
will do what you describe. You should also look at arrows(), in case
you want points or crossbars on the ends of the segments.
Duncan Murdoch