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From |
"Martin Weiss" <martin.weiss1@gmx.de> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
RE: Rép. : st: RE: Command -contrast- after -anova |

Date |
Tue, 9 Dec 2008 16:21:58 +0100 |

Line for the server... I am not an expert on the internals of Phil`s program, but it was released in 2008, so at least this takes you closer to Stata 10. David suggested this package as well, I think your messages just crossed... HTH Martin -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Herve STOLOWY Sent: Tuesday, December 09, 2008 4:18 PM To: statalist@hsphsun2.harvard.edu Subject: Rép. : st: RE: Command -contrast- after -anova 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" <martin.weiss1@gmx.de> 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: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Herve STOLOWY Sent: Tuesday, December 09, 2008 3:06 PM To: statalist@hsphsun2.harvard.edu 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 * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**Rép. : st: RE: Command -contrast- after -anova***From:*"Herve STOLOWY" <stolowy@hec.fr>

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