Dear Statalisters--
The constant term reported by -desmat- using the defcon(dev#)) option, is not the constant I expected.
In the example given below, the constant term reported by -desmat- is an un-weighted mean of the within category means, where I would have expected the overall mean to be reported!
Is this a bug or the intension?
I am using Stata 8 for Windows updated 15 Dec 2003, and my -desmat- is up to date:
. which desmat
c:\ado\stbplus\d\desmat.ado
*! version 3.1, 29Oct2002, [email protected]
Example:
In the following, somewhat silly, example I would like to see if one category of 'education years' (soev1: 3 categories (<8, <11, or more)) have a mean height which differs from the overall mean height:
The mean height of the sample population is:
. su height if soev1!=.
Variable | Obs Mean Std. Dev.
---------+-------------------------------
height | 15089 167.933 9.044364
And the height by category of educational years is:
. table soev1, c(mean height freq) f(%9.3f) row
----------------------------------------
education |
, years | mean(height) Freq.
----------+-----------------------------
1 | 165.955 6,687
2 | 168.886 6,772
3 | 172.089 1,630
|
Total | 167.933 15,089
----------------------------------------
(Higher people have more education years (or vice versa)).
