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st: Line of equality in scatter plot


From   "LL Miller, Avon Longitudinal Study Parents and Children" <L.L.Miller@bristol.ac.uk>
To   statalist@hsphsun2.harvard.edu
Subject   st: Line of equality in scatter plot
Date   Wed, 08 Oct 2008 15:59:10 +0100

Afternoon all,

I'm trying to assess the reliability of a continuous variable with the same variable assessed by a second person. I have used alpha var1 var2 to get Cronbachs alpha but wanted to see what it is doing visually. I created a scatter plot but can't find any option that will allow me to draw a line on the plot through the diagonal i.e. where the points should fall if there is no difference in the two assessments.

I have encountered several other useful things like ovfplot for after regression plots but this since I am not doing regression this is not quite what I want.

Does anyone know how to do this?

Cheers

Laura

----------------------
Please note new address and contact details from 22nd July 2008
LL Miller, Avon Longitudinal Study Parents and Children (ALSPAC)
Department of Social Medicine
University of Bristol
Oakfield House
Oakfield Grove
Clifton
Bristol BS8 2BN

Room number: BS9
Phone: +44(0) 117 331 0105
Fax: +44(0) 117 331 0080
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