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st: Using weights in a graph dot

From   "Salome Dell-Kuster" <>
To   <>
Subject   st: Using weights in a graph dot
Date   Thu, 03 Sep 2009 18:11:40 +0200


i got stuck in a problem with the weights for a 'graph dot'.  And if I
may, I would like to ask you for help.

My plan was to create a 'graph dot' for several groups where the size of
the marker should represent the number of observations in the
corresponding group. I could find the weight-option in the help file and
tried several ways but without success (on the other hand, I was able to
do it the same way in a scatter plot, which is not as convenient for all
the other features of the graph). The ways I tried out was with _n
(system variable) and with a variable including the effectiv numbers of
observations and I also used proportions as another solution - but
nothing worked. 

My command: graph dot (median) diff_ga_aa [aweight=number], over(group1)

One problem could be that the number of observations goes from about 2
to 1400 in the different groups.

Could you give me any hints how to solve this problem or recommend me a
book where I can find an example. 

Thank you very much in advance for your help.

Kind regards,

Salome Dell-Kuster

Salome Dell-Kuster, MD MSc
Departement Anästhesie 
& Institut für klinische Epidemiologie
Universitätsspital Basel
CH - 4031 Basel

+41 61 265 25 25
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