Michael, I apprecate your response. The inner and outer parameters to do not affect the results produced by lme. I am still left with the same questions I had before;
(1) How does one include factors in groupData (2) What is the meaning and use of the outer and inner parameters in groupData? Thank you again, John John David Sorkin M.D., Ph.D. Professor of Medicine Chief, Biostatistics and Informatics University of Maryland School of Medicine Division of Gerontology and Geriatric Medicine Baltimore VA Medical Center 10 North Greene Street GRECC (BT/18/GR) Baltimore, MD 21201-1524 (Phone) 410-605-7119 (Fax) 410-605-7913 (Please call phone number above prior to faxing) ________________________________ From: Michael Dewey <li...@dewey.myzen.co.uk> Sent: Thursday, March 22, 2018 10:30 AM To: Sorkin, John; RHELP <r-h...@stat.math.ethz.ch> Subject: Re: [R] How do I include a factor in a groupedData object? Meaning and use of inner and outer parameters CAUTION: This message originated from a non UMB, UMSOM, FPI, or UMMS email system. Whether the sender is known or not known, hover over any links before clicking and use caution opening attachments. Dear John You are only allowed to have the primary covariate on the left hand side of the vertical bar. Other covariates go in inner or outer. Michael On 22/03/2018 12:59, Sorkin, John wrote: > Windows 10 64-bit, R-Studio, R version 3.4.3 > > > Several questions relating to groupedData: > > (1) I am trying to create a groupedData object that can be used to run an > analysis that I have been able to urn using lmer. When I include the > interaction terms in the groupedData opbject I get an error message stating > that + is not meaningful for factors. How do I include factors in my model? > See code and error below. > > (2) I have read the help file for groupedData multiple times. I am unable to > understand the meaning or, or the use for the inner= and outer= parameters in > the call to groupedData. Can someone either explain the meaning of these > parameters or refer me to a source that give a clear explanation? > > >> fit0 <- >> lmer(THmean~INTRVNTN+factor(TimePtID)+INTRVNTN*factor(TimePtID)+(1|PatientID),data=smalldata) >> sdgd <- >> groupedData(THmean~INTRVNTN+TimePtID+INTRVNTN*TimePtID|PatientID,data=smalldata) > Warning messages: > 1: In Ops.factor(INTRVNTN, TimePtID) : �+� not meaningful for factors > 2: In Ops.factor(INTRVNTN, TimePtID) : �*� not meaningful for factors > > > Thank you, > > John > > > John David Sorkin M.D., Ph.D. > Professor of Medicine > Chief, Biostatistics and Informatics > University of Maryland School of Medicine Division of Gerontology and > Geriatric Medicine > Baltimore VA Medical Center > 10 North Greene Street > GRECC (BT/18/GR) > Baltimore, MD 21201-1524 > (Phone) 410-605-7119 > (Fax) 410-605-7913 (Please call phone number above prior to faxing) > > > [[alternative HTML version deleted]] > > > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. > -- Michael http://www.dewey.myzen.co.uk/home.html [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
