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Re: st: RE: FW: graphing ordinal panel data over time

From   Maarten buis <>
Subject   Re: st: RE: FW: graphing ordinal panel data over time
Date   Tue, 8 Jun 2010 12:16:59 +0000 (GMT)

--- Seed, Paul forwarding
> I have got an ordered outcome variable with three values
> over a period of 20 years. To describe the data, I want
> to show how the three values of my outcome variable have
> developed over time.

--- On Tue, 8/6/10, Nick Cox wrote:
> There are several possible graphs here. For example, you 
> can -contract- and then just draw line plots of frequencies
> or percents. Another way to do it directly is using 
> -catplot- (SSC). 

Yet another way would be look at -proprcspline-, see 
-ssc d proprcspline- and 

An important difference is that -proprcspline- also applies
certain amount of smoothing, which can for example be helpful 
when some the of the periods contain relatively few cases, such
that the changes between periods becomes too eratic. 

Hope this helps,

Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen


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