You have some choices fitchange$coefficients[2]
zz$coefficients[2,1] Note that class(zz$coefficients) shows that it is a matrix. HTH, Eric On Fri, Feb 22, 2019 at 9:45 AM Sorkin, John <jsor...@som.umaryland.edu> wrote: > I am trying to obtain the coefficients from a regression (performed using > lm). I would like to get the value for the slope (i.e. estimate) for pre > from the following regression: > > > fitchange <- lm(post-pre~pre,data=mydata2) > > > I have tried the following without any success: > > > zz <- summary(fitchange)["coefficients"] > class(zz) > print(zz) > zz[[2,1]] > zz[2,1] > zz["pre","Estimate"] > > > I clearly don't know how to select elements from the list returned by the > summary function. > > > A reproducible version of my code follows: > > > mydata2 <-structure(list(pre = c(71.3302299440613, 86.2703384845455, > 120.941698468568, > 80.9020778388552, 84.9927752038908, > 77.9108032451793, 111.007107108483, > 93.288442414475, 126.097826796255, > 111.63734644637), > post = c(45.9294556667686, > 114.661937978585, 138.501558726477, > 55.355775963925, 97.7906200355594, > 71.1008233796004, 149.308274695789, > 122.828428213951, 143.690814568562, > 116.607579975539)), class = "data.frame", > row.names = c(NA, -10L)) > > fitchange <- lm(post-pre~pre,data=mydata2) > zz <- summary(fitchange)["coefficients"] > class(zz) > print(zz) > zz[[2,1]] > zz[2,1] > zz["pre","Estimate"] > > > Any help you can offer would be appreciated. > > > > > > > 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. > [[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.
