From: Jim Lindsey <jlindsey@luc.ac.be> Message-Id: <9605280904.AA03947@alpha.luc.ac.be> Subject: R-alpha: graphs and glms To: r-testers@stat.math.ethz.ch Date: Tue, 28 May 1996 11:04:47 +0200 (MET DST) Here are some miscellaneous problems I picked up over the weekend with 0.6: (1) The problem with PAGER was that Linux sets it to less with the option -P followed by the prompt string in double quotes. This is not handled properly, the string being broken up at spaces, but it appears to be a Linux problem, not R. (2) typing in, for example trying to assign values to it, gives a syntax error (3) There is a problem with the W&R notation, both in lm() and glm(). I was fitting models to a 2-way contingency table with both variables having ordered values. The minimal model, sum of the two factor variable margins, and the saturated model, interaction (*) of these two variables, are identical to GLIM. But putting the two factor margins plus a linear interaction (x1+x2+lx1:lx2) is wrong. Still a different answer is obtained if a new variable (int <- lx1*lx2) is calculated and used (x1+x2+int). Neither is the same as GLIM and both are obviously wrong, although they should be the same. That was glm() with poisson. The same problem occurs with lm() (4) The way interaction coefficients for factor variables are currently displayed is completely unreadable. (5) There is a problem with the fact that boxplot() has two sets of triple dots in the options. If x and y are two variables, boxplot(x,y) puts the first value of y as title. boxplot(x,lty=1) gives 2 boxplots, the second wrong. boxplot(x,main="title") gives a syntax error. Jim =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- r-testers mailing list -- To (un)subscribe, send subscribe or unsubscribe (in the "body", not the subject !) To: r-testers-request@stat.math.ethz.ch =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-