Dear Peter, > -----Original Message----- > From: Peter Dalgaard [mailto:[EMAIL PROTECTED] > Sent: Friday, February 11, 2005 8:57 AM > To: John Fox > Cc: 'Vito Ricci'; [EMAIL PROTECTED]; > [email protected] > Subject: Re: [R] Re: testing slopes different than a given value > > "John Fox" <[EMAIL PROTECTED]> writes: > > > Dear Vito, > > > > Since Manuel says that he wants to "obtain a test" and not > "obtain two > > tests," I assume that he's interested in the F-test for the > hypothesis > > that both coefficients are simultaneously equal to the specified > > values rather than in the t-tests for the individual hypotheses. > > > > Regards, > > John > > ...in which case one answer is this: > > > y<-3+0.6*x1+0.3*x2 + rnorm(100,sd=.1) # as meant, no? > > fm<-lm(y~x1+x2) > > anova(fm, lm(y~offset(0.6*x1+0.3*x2))) > Analysis of Variance Table > > Model 1: y ~ x1 + x2 > Model 2: y ~ offset(0.6 * x1 + 0.3 * x2) > Res.Df RSS Df Sum of Sq F Pr(>F) > 1 97 1.06118 > 2 99 1.06184 -2 -0.00066 0.0302 0.9703 >
Indeed, or as I responded yesterday, to use the linear.hypothesis function in the car package. Regards, John > > > -- > O__ ---- Peter Dalgaard Blegdamsvej 3 > c/ /'_ --- Dept. of Biostatistics 2200 Cph. N > (*) \(*) -- University of Copenhagen Denmark Ph: > (+45) 35327918 > ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: > (+45) 35327907 ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
