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Re: st: generating one twoway graph using by

From   Nick Winter <>
Subject   Re: st: generating one twoway graph using by
Date   Fri, 24 Sep 2004 10:49:19 -0400

Nick Cox suggested three good, more-or-less pre-packaged solutions.

Another way to go, which generalizes to other cases where one needs to generate multiple graph statements, might be something like this:

levels PID , local(levs)
foreach val of local levs {
local cmd `cmd' (line ivalue idate if PID==`val')
graph twoway `cmd' , legend(off)

This builds up your (massive) list of graph commands in a loop, then executes them all at the end.

I'm not sure that plotting all 200 in one graph will generate anything comprehensible, but it can be done . . .

--Nick Winter

At 10:27 AM 9/24/2004 -0400, you wrote:

Hello all,

I am trying to make a line plot of many individuals values over time
in one graph. I am hoping that there is someway to shortcut around the
syntax of -twoway- using -by- such that I do not need to specify all
individuals (I have nearly 200).

I started with
twoway (line ivalue idate, by(PID))
but that gave 200 individual graphs.

so did
twoway (line ivalue idate), by(PID)
but that gave the same thing.

I am hoping to avoid needing to write
twoway (line ivalue idate if PID==1) (line ivalue idate if PID==2) ......

Should I stop hopeing, and start writing?

Thanks in Advance,

Dan Egan
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Cornell University
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