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st: failure of by options with twoway scatter

From   jwegelin <>
Subject   st: failure of by options with twoway scatter
Date   Thu, 11 Oct 2007 15:00:57 -0400

The following command works fine.

twoway (scatter CEC week), by (Group) yscale(log)

(Group takes on three values.) But when I attemmpt to add "by options" I 
get errors:

. twoway (scatter CEC week), by (Group, total) yscale(log)
) required

Also when I attempt to use the syntax in the Stata Release 10 Graphics 
manual (page 406), I get an error:

. scatter CEC week, by (Group)
option by() not allowed

although the yscale option works.

. scatter CEC week, yscale(log)

I am using

.  about

Stata/MP 10.0 for Macintosh
Born 25 Jul 2007
Copyright (C) 1985-2007

Thanks for any advice.

Jacob A. Wegelin
Assistant Professor
Department of Biostatistics
Virginia Commonwealth University
730 East Broad Street Room 3006
P. O. Box 980032
Richmond VA 23298-0032

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