It's the print method that determines this. See stats:::print.summary.lm
and in particular the if clause beginning: if (rdf > 5L) { R code is open source. Once you know what to look for, you can examine it yourself. -- Bert On Mon, Jan 9, 2012 at 9:25 AM, Rich Shepard <rshep...@appl-ecosys.com> wrote: > All but one of the summaries of multiple linear regressions in this > analysis set present the residuals by min, 1Q, median, 3Q, and max. Example: > > lm(formula = TDS ~ Cond + Ca + Cl + Mg + Na + SO4, data = snow.cast) > Residuals: > Min 1Q Median 3Q Max -277.351 -32.551 -2.621 > 40.812 245.272 > > The one that doesn't has only a small number of rows (23) and presents the > results as: > > lm(formula = TDS ~ Cond + Ca + Cl + Mg + SO4, data = rnchH.cast) > Residuals: > 8 9 10 11 12 13 14 16 20 21 > -2.1926 3.2306 -3.9823 -4.0491 0.5284 1.9354 2.4798 0.8952 -3.0642 > 0.8781 > 22 > 3.3408 > > What might cause this difference? > > Rich > > ______________________________________________ > 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. -- Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 467-7374 Website: http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm ______________________________________________ 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.