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st: RE: Confidence Intervals plot

From   "Nick Cox" <>
To   <>
Subject   st: RE: Confidence Intervals plot
Date   Tue, 13 Sep 2005 22:02:05 +0100

Questions of the form "I tried such-and-such 
a program, but it didn't produce what I want"
are pretty difficult to answer, especially 
if you are fuzzy on what you want. 

The programmer is inclined to say, "Well, 
feel free to write your own program then!" 

-ciplot- is a program on SSC I wrote. 

Your reference to -ecplot- I take to mean 
one to -eclplot- by Roger Newson. 

-ciplot- is a wrapper for -ci-, as its help 
explains. I am not clear, as you do not say, 
whether you would expect -ci- to produce 
your confidence intervals. But if you don't 
then -eclplot- should be fine for your purpose. 

In general, confidence intervals plots 

     * the way you like them * 

are easy. What is difficult for a 
programmer is to prepare for all the ways that 
people like them. In your case, you would need

calculate your quintile groups 

calculate your confidence intervals 

decide on how to represent estimates, e.g. 
-scatter- or -twoway bar-

decide on how to represent limits, e.g. 
-twoway rcap-. 

Then a typical plot requires an overlay 

twoway ... || ... 

Further advice would require a more precise 


Xavi Barber
> I have two variables A and B (continuous), and C (Yes o No variable)
> I'd like to have a plot with the Confidence Intervals plot for A in 
> quintiles of B by C
> I tried  a lot of plots commands, probably I'm a very bad 
> graphs user, but 
> I didn't find it.
> ciplot  and variants
> ecplot
> ....

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