This seems like a fundamental misunderstanding on your part of how operators, and in particular logical expressions, work in computer languages. Consider some examples:
1+2 has a numeric answer because 1 and 2 are both numeric. 1+"a" has at the very least not a numeric answer because the values on either side of the "+" sign are not both numeric. TRUE | FALSE has a logical type of answer because both sides of the logical "or" operator are logical. However, you are expressing something like TRUE | "a string" which might mean something but that something generally is not a logical type of answer. Try variable=="value a" | variable=="value b" or variable %in% c( "value a", "value b" ) You would probably find that the Introduction to R document that comes with R has some enlightening examples in it. You might also find Pat Burns' "The R Inferno" entertaining as well (search for it in your favorite search engine). --------------------------------------------------------------------------- Jeff Newmiller The ..... ..... Go Live... DCN:<jdnew...@dcn.davis.ca.us> Basics: ##.#. ##.#. Live Go... Live: OO#.. Dead: OO#.. Playing Research Engineer (Solar/Batteries O.O#. #.O#. with /Software/Embedded Controllers) .OO#. .OO#. rocks...1k --------------------------------------------------------------------------- Sent from my phone. Please excuse my brevity. On February 11, 2015 8:42:58 PM EST, Brennan O'Banion <brennan.oban...@gmail.com> wrote: >I am aware that it is possible to specify a subset with a single >logical operator when constructing a model, such as: >svyglm(formula, design=data, subset=variable=="value"). > >What I can't figure out is how to specify a subset with two or more >logical operators: >svyglm(formula, design=data, subset=variable=="value a"|"value b"). > >Is it possible to specify a subset in this way using *glm without >having to, in my case, subset the original data, create a survey >design, and then fit a model? > >______________________________________________ >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. ______________________________________________ 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.