When you imported did you not import the headers? Joe King 206-913-2912 j...@joepking.com "Never throughout history has a man who lived a life of ease left a name worth remembering." --Theodore Roosevelt
-----Original Message----- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of jim holtman Sent: Sunday, December 20, 2009 3:11 PM To: John Paul Telthorst Cc: r-help@r-project.org Subject: Re: [R] "Object is not a matrix" Error Where is the object 'write'? SHouldn't you be using: lm(visits ~ (day.f)) On Sun, Dec 20, 2009 at 5:59 PM, John Paul Telthorst <jpteltho...@gmail.com>wrote: > I'm trying to follow this guide here: > http://www.ats.ucla.edu/stat/r/modules/dummy_vars.htm > > In which I'm creating categorical variables using the factor function. > > I am able to go through the example listed above and have everything work, > however, when I try to input my own numbers, I get an error. I input the > following: > > > > hits = read.csv(file.choose()) > > > attach(hits) > > > day.f <- factor(day) > > > lm(write ~ (day.f)) > > lm(write ~ (day.f)) > > Error in model.frame.default(formula = write ~ (day.f), drop.unused.levels > = > > TRUE) : > > object is not a matrix > > > > So I import "hits = read.csv(file.choose())" a .csv file, which has the > columns "visits" and "day" where "visits" is the number of hits to a > website, and "day" is a number 1-7, for example 1 corresponds to Sunday and > 7 corresponds to Saturday. I understand that the day variable needs to be > a > categorical variable, and I'm trying to use the factor function to do this. > I would like to be able to run a regression that will correlate the day > with the number of hits. > > Any help would be much appreciated. > > [[alternative HTML version deleted]] > > ______________________________________________ > 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<http://www.r-project.org/posting -guide.html> > and provide commented, minimal, self-contained, reproducible code. > -- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem that you are trying to solve? [[alternative HTML version deleted]] ______________________________________________ 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. ______________________________________________ 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.
