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st: RE: RE: Graph: Control plot region- contract, not expand


From   DE SOUZA Eric <eric.de_souza@coleurope.eu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: RE: Graph: Control plot region- contract, not expand
Date   Thu, 16 Jun 2011 18:10:45 +0200

I don't think this is what Amanda wanted.  The way I understand her, she wishes to estimate and fit a line over the range (a b) but only show the graph for that fit over  the range (c d) where a < c and d < b


Eric de Souza
College of Europe
Brugge (Bruges), Belgium
http://www.coleurope.eu


-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Fiedler, James (JSC-SK)[USRA]
Sent: 16 June 2011 17:55
To: statalist@hsphsun2.harvard.edu
Subject: st: RE: Graph: Control plot region- contract, not expand

Hello, 

I haven't seen a response to this yet, so I'll take a stab at it.

I'll have to make some assumptions, since you haven't explicitly said which command you are using.

I assume you're using -twoway lfit-.

Here's another option, which forgoes the convenience of -twoway lfit- but gives extra control:

regress y x
predict yhat
twoway (scatter y x if x >= 1 & x <= 10) (line yhat x if x >= 1 & x <= 10, sort(x))


James

________________________________________
From: owner-statalist@hsphsun2.harvard.edu [owner-statalist@hsphsun2.harvard.edu] On Behalf Of Amanda Blakely Delp [abd35@georgetown.edu]
Sent: Thursday, June 16, 2011 10:13 AM
To: statalist@hsphsun2.harvard.edu
Subject: st: Graph: Control plot region- contract, not expand

Hello all,

I'm trying to create a fairly simple graph- just a scatterplot overlayed with a linear prediction.  My problem is that I can't seem to control which area of the graph to display. I know I can expand the plot region, but there doesn't seem to be a similar code to force-contract it.

All I care about is the 1-10 region on my scale (x-axis), where some outliers are outside of this region.  Of course, if I drop these outliers, the graph region cooperates.  Is it possible to crop the display region without dropping the observations which determine the behavior of the linear prediction?  Like a way to force the command
"xscale(range(0 10)"?

Ideally, I'd like to compare 2 graphs-- one with the outliers, and one without, but only along the smaller region of the x-axis.

Many thanks-
Amanda

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