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st: adjusted mean by group


From   Rachele Capocchi <rachele.capocchi@arsanita.toscana.it>
To   statalist@hsphsun2.harvard.edu
Subject   st: adjusted mean by group
Date   Tue, 23 Oct 2007 17:51:25 +0200


I have some problems with the adjusted means.
I did the adjusted means on quantitative variable (_8pgf2a) by a group var adjusting for uri_enz_creat_mg24h.

xi: regress _8pgf2a i.gruppi_ord uri_enz_creat_mg24h
adjust uri_enz_creat_mg24h , by( gruppi_ord)

RECODE of |
gruppi | xb
----------+----
* 0 | 1309,4*
1 |1027,86
2 | 1068,04


Then I need to do the same, considering the sex.
     anova _8pgf2a gruppi_ord uri_enz_creat_mg24h if sesso==1,continuous( uri_enz_creat_mg24h)
adjust uri_enz_creat_mg24h , by( gruppi_ord)

RECODE of |
gruppi | xb
----------+-----------
* * 0 | 1359,01**
1 | 994,102
* 2 | 1127,67*
anova _8pgf2a gruppi_ord uri_enz_creat_mg24h if sesso==2, continuous( uri_enz_creat_mg24h)
adjust uri_enz_creat_mg24h , by( gruppi_ord)

RECODE of |
gruppi | xb
----------+-----------
* * 0 | 1424,16**
1 | 1261,85
* 2 | 1237,97
*

*How is it possible ? The overall means are not between the two value of sex ! Do you think is it possible ?*

Best Regards,
Rachele
--
Rachele Capocchi
Agenzia Regionale Sanità Toscana
"U.O. Centro Statistico Elaborazione Dati"
Sede Operativa - viale Milton,7
50134 Firenze
Tel. 055-4624354
Fax. 055-4624345
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