[R] How to extract parameter estimates of variance function from lme fit
Dear R-Users, I have a question concerning extraction of parameter estimates of variance function from lme fit. To fit my simulated data, we use varConstPower ( constant plus power variance function). fm-lme(UPDRS~time,data=data.simula,random=~time,method=ML,weights=varConstPower(fixed=list(power=1))) I extract the results of this function by using the following codes: y-summary(fm) x-y$modelStruct$varStruct x Variance function structure of class varConstPower representing constpower 1.184535e-15 1.00e+00 These are the constants and power that apppear in the summary(fm), and that I want to extract. Hower I got different value of const when extracting from x: x$const const -34.36943 Does anyone know why there is such difference and how to extract the expected value (1.184535e-15) ? Thanks in advance for your help. Thu --- THAI Hoai Thu INSERM U738 - Université Paris 7 16 rue Henri Huchard 75018 Paris, FRANCE Tel: 01 57 27 75 39 Email: hoai-thu.t...@inserm.fr __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] How to extract parameter estimates of variance function from lme fit
Try this: coef(fm$modelStruct$varStruct, uncons = FALSE) On Fri, Oct 15, 2010 at 11:42 AM, Hoai Thu Thai hoai-thu.t...@inserm.frwrote: Dear R-Users, I have a question concerning extraction of parameter estimates of variance function from lme fit. To fit my simulated data, we use varConstPower ( constant plus power variance function). fm-lme(UPDRS~time,data=data.simula,random=~time,method=ML,weights=varConstPower(fixed=list(power=1))) I extract the results of this function by using the following codes: y-summary(fm) x-y$modelStruct$varStruct x Variance function structure of class varConstPower representing constpower 1.184535e-15 1.00e+00 These are the constants and power that apppear in the summary(fm), and that I want to extract. Hower I got different value of const when extracting from x: x$const const -34.36943 Does anyone know why there is such difference and how to extract the expected value (1.184535e-15) ? Thanks in advance for your help. Thu --- THAI Hoai Thu INSERM U738 - Université Paris 7 16 rue Henri Huchard 75018 Paris, FRANCE Tel: 01 57 27 75 39 Email: hoai-thu.t...@inserm.fr __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40 S 49° 16' 22 O [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] How to extract parameter estimates of variance function from lme fit
Thank you Henrique!! It works. Thu Le 15/10/2010 16:53, Henrique Dallazuanna a écrit : coef(fm$modelStruct$varStruct, uncons = FALSE) __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
