Dear Martin:
I use Stata 10. I use the official Stata's commands + -contrast- (downloadable from ssc).
Here is my output:
contrast return info risk, coeffs(1 1), if round>7 & round<26 & offer==1 & win==1
+-------------------------------------------------+
| info __n __mean __res_sd __coeffs __a |
|-------------------------------------------------|
| Full 0 . . 1 0 |
+-------------------------------------------------+
Variable | Obs Contrast Std. Err. [95% Conf. Interval]
| (L) SE(L)
---------+-------------------------------------------------------------
return | 2309 . . . .
Hypothesis test of contrast = 0 (L = 0): t = ., P = .
Hypothesis test of equal info means: F = 10.973, P = 0.0009
Residual SD (with 2306 df) from analysis of variance = .02661463
There is no real error message but I get almost only dots.
I found another command -anovacontrast- (donwnloadable from http://www.ats.ucla.edu/stat/stata/ado/analysis).
Should I use it preferably?
Best regards
Herve
***********************************************************
Professeur/Professor
President of the French Accounting Association (AFC)
HEC Paris
Departement Comptabilite Controle de gestion / Dept of Accounting and Management Control
1, rue de la Liberation
78351 - Jouy-en-Josas
France
Tel: +33 1 39 67 94 42 - Fax: +33 1 39 67 70 86
mail: stolowy at hec dot fr
web: http://www.hec.fr/stolowy
>>> "Martin Weiss" <[email protected]> 09/12/08 15:20 >>>
Line for the server...
What is the error code that you get?
- net describe contrast, from(http://fmwww.bc.edu/RePEc/bocode/c)- gives
1998 as the distribution date, and the command requests -version 4.0- when
run. The examples given are indeed defunct, but it seems that no one has
worked on them for at least a decade.
Anyway, you should say if you use anything other than official Stata`s
commands in your posts...
HTH
Martin
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Herve STOLOWY
Sent: Tuesday, December 09, 2008 3:06 PM
To: [email protected]
Subject: st: Command -contrast- after -anova
Dear Statalisters:
I have some difficulties in using the -constrast- command (downloadable from
ssc) after -anova-.
Here is my -anova- command line with the output.
anova return info risk info*risk if round>7 & round<26 & offer==1 & win==1,
detail
Factor Value Value Value Value
------------------------------------------------------------------------
info 1 0 2 1
risk 1 0 2 1
Number of obs = 2309 R-squared =
0.0401
Root MSE = .026537 Adj R-squared =
0.0389
Source | Partial SS df MS F Prob >
F
-----------+----------------------------------------------------
Model | .067894615 3 .022631538 32.14
0.0000
|
info | .007341846 1 .007341846 10.43
0.0013
risk | .045207121 1 .045207121 64.20
0.0000
info*risk | .010246209 1 .010246209 14.55
0.0001
|
Residual | 1.62318282 2305 .000704201
-----------+----------------------------------------------------
Total | 1.69107744 2308 .000732703
In the -contrast- command, I use the following syntax:
contrast return info risk, coeffs(1 1), if round>7 & round<26 & offer==1 &
win==1
and it does not work.
I am almost sure that the figures after coeffs are wrong. To be honest, I do
not understand very well the help file of -contrast-. (I tried the examples
given in this file, based on auto.dta, but it returns an error message).
Does someone have some practice with -contrast-?
(I read the Stata manual and the differents threads in the Statalist. It
seems that the -contrast- command should avoid using the command -test- with
matrices after anova).
Best regards
Herve
***********************************************************
Professeur/Professor
President of the French Accounting Association (AFC)
HEC Paris
Departement Comptabilite Controle de gestion / Dept of Accounting and
Management Control
1, rue de la Liberation
78351 - Jouy-en-Josas
France
Tel: +33 1 39 67 94 42 - Fax: +33 1 39 67 70 86
mail: stolowy at hec dot fr
web: http://www.hec.fr/stolowy
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