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st: Interpreting margins after zip


From   "McCollister, Kathryn E" <KMcColli@med.miami.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: Interpreting margins after zip
Date   Mon, 20 Jun 2011 15:20:09 -0400

We are running SVY:ZIP with MARGINS in STATA 11 to produce the predicted
margins. We need some help in interpreting the MARGINS output.  Below is the
output for the age categories (there are more independent variables besides
agec).
 
             |            Delta-method
             |     Margin   Std. Err.      z    P>|z|     [95% Conf.
Interval]
        agec |
          1  |   57.43919   4.577922    12.55   0.000     48.46663
66.41175
          2  |   115.1437   6.595634    17.46   0.000     102.2165
128.0709
          3  |   323.1946   24.02329    13.45   0.000     276.1098
370.2794
 
Is this the adjusted mean for each age category?
 
If I use STATA 10 and the mfx command with predict(n) with the same zip
model, I get the following for age categories 2 and 3.
 
variable |      dy/dx    Std. Err.     z    P>|z|  [    95% C.I.   ]      X
---------+------------------------------------------------------------------
--
_Iagec_2*|   71.59662       10.61    6.75   0.000    50.801  92.3922
.343407
_Iagec_3*|   316.6243      31.971    9.90   0.000   253.963  379.286
.162608
 
How are these results interpreted?



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