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st: overlaid graphics


From   "John D. Levendis" <john-levendis@uiowa.edu>
To   statalist <statalist@hsphsun2.harvard.edu>
Subject   st: overlaid graphics
Date   Sun, 15 Feb 2004 23:40:37 -0600

Hello Statalisters,

I've got a question regarding how to overlay two time series.

Let say I've got a Price Series (Pr) and from it, I generate a Price Index (PI) 
that just divides Pr by it's base year value:
. gen PI = Pr/Pr[1]

Appropriately scaled these two series, when overlaid should match up perfectly.
What I would like to do is graph both these series, and if I look at the units 
on the left hand side of the graph, I get the Price values, and if I look at 
the units on the right hand side, I get the Index values.

I thought something like:
. twoway (connected Pr year) (connected PI year, yaxis(2))

But they don't line up exactly. How can I force them to?

This problem holds even in the simpler case where:
. gen Pr2 = Pr + 100
. twoway (connected Pr year) (connected Pr2 year, yaxis(2))


Many thanks.

--John


----------------------------------------
John D. Levendis
W210 Pappajohn Bus. Bldg
University of Iowa
Iowa City, IA 52242
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Can you imagine being from Oz
and moving to Kansas?!
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