# r-bugs@r-project.org The problem occurs when the model matrix has a single column.
elastic <- data.frame(stretch=c(46,54,48,50,44,42,52),
distance=c(183,217,189,208,178,150,249))
elastic.lm <- lm(distance ~ -1 + stretch, data=elastic)
predict(elastic.lm,se=T)
Error in XRinv^2 %*% rep(res.var, p) : non-conformable arguments The fix is to replace XRinv <- qr.Q(object$qr)[, p1] with XRinv <- qr.Q(object$qr)[, p1, drop=FALSE] The statement is five lines above XRinv^2 %*% rep(res.var, p) John Maindonald. --please do not edit the information below-- Version: platform = i386-pc-mingw32 arch = x86 os = Win32 system = x86, Win32 status = major = 1 minor = 3.0 year = 2001 month = 06 day = 22 language = R Windows ME 4.90 (build 3000) Search Path: .GlobalEnv, package:ctest, Autoloads, package:base John Maindonald email : john.maindonald@anu.edu.au Statistical Consulting Unit, phone : (6125)3473 c/o CMA, SMS, fax : (6125)5549 John Dedman Mathematical Sciences Building Australian National University Canberra ACT 0200 Australia -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-devel mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-devel-request@stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._