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# Re: st: Scatterplot: Weighted markers change size

 From Svend Juul To Subject Re: st: Scatterplot: Weighted markers change size Date Wed, 30 Jul 2008 15:46:24 +0200

```Friedrich wrote:

-scatter- supports weights. When a scatterplot is drawn, all weighted
markers have a distinct size. This size changes when the data are
divided into two or more groups and then drawn as overlaid
scatterplots. I am looking for a way to retain the size of the
original markers. The problem is best understood with an example.

clear all
input x y weight group
1 1 1 1
2 1 10 1
1 2 100 2
2 2 1000 2
end
scatter y x [w=weight], name(A)
twoway (scatter y x if group==1 [w=weight]) ///
(scatter y x if group==2 [w=weight]), name(B)

Compare graphs A and B. In graph A all four markers have a different
size. In graph B there are two pairs of markers with the same size. I
would like to have the same marker sizes in graph B as in graph A
while keeping the colors that identify the two different groups. How
can I do this?

===============================================================

You can use the msize() option to modify the marker size. By trial
and error I got something close to what you want - but actually I
cannot figure out why 0.2 and 2 are the right factors:

twoway (scatter y x if group==1 [w=weight] , msize(*0.2)) ///
(scatter y x if group==2 [w=weight] , msize(*2)), name(C)

Hope this helps
Svend

________________________________________________________

Svend Juul
Institut for Folkesundhed, Afdeling for Epidemiologi
(Institute of Public Health, Department of Epidemiology)
Vennelyst Boulevard 6
DK-8000 Aarhus C,  Denmark
Phone, work:   +45 8942 6090
Phone, home:   +45 8693 7796
Fax:           +45 8613 1580
E-mail:        sj@soci.au.dk
_________________________________________________________

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