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st: RE: test for trend of an ordinal predictor
From
"Nick Cox" <[email protected]>
To
<[email protected]>
Subject
st: RE: test for trend of an ordinal predictor
Date
Mon, 26 Apr 2010 15:53:55 +0100
A basic graphical comparison of distributions for the three categories
is also essential. -dotplot- or -stripplot- (SSC) will help, for
example.
Nick
[email protected]
Georgia
I am fitting a regression model with a normally distributed outcome (y)
and an ordinal variable in 3 levels (x) as predictor. Obviously, when I
use the command
xi: regress y i.x
I get separate coefficients for the second and the third level of the
predictor while the first level is treated as reference. However, I
would be very interested in testing the trend of the ordinal variable.
In such a case, do I simply treat my ordinal var as a continuous one by
typing
regress y x
or is there a better way to test the trend of x? I would appreciate any
help on this.
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