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st: RE: graph question

From   "Nick Cox" <>
To   <>
Subject   st: RE: graph question
Date   Mon, 20 Apr 2009 14:15:00 +0100

This started a long thread involving several suggestions from Martin

The basic class of problems I take to be plotting means and confidence
intervals for various cross-classified groups. 

I'd just like to point out that this is, not surprisingly, a problem
often met before. Among various other solutions -stripplot- on SSC
supports -over()- and -by()- options. 


Nikolaos Pandis

I have continuous data for two trial arms (control and experiment). 
There are 50 measurements per arm. 
Data is collected at 6 time intervals.

I would like to plot a bar chart with the x axis showing the intervals
(0, 1, 3, 6, 9, 12 months). Within each interval I would like to have
one bar for the control and one for the experimental group.
The y axis shows the mean of the measurement of interest.

Additionally, I would like to show the confidence intervals at each
interval per treatment group.

Alternatively, I would like to draw  a line plot with the same y and x
axis information, except that the two lines  would represent the control
and the experimental groups.

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