> On Jul 31, 2015, at 1:49 PM, Adam Jauregui <adm...@gmail.com> wrote: > > Hello R-help, > > I am trying to compute the mean of a quarterback's career fantasy football > stats, but I wish to exclude his 2014 stats from the mean, as that will be > the test data for the model I am trying to build for my academic undergrad > research. > > The code for figuring out the mean of his Yds for every career Game 1 was > simple: > > > *mean(brady.t$Yds[brady.t$G. == 1])* > How can I make an "if-then" statement though so that his 2014 stats are > excluded? Or is there an easier way besides "if-then?" > > Thank you, > > AKJ
It would be helpful to have a sample of data to know the structure, but take a look at: ?subset for examples of more complicated logic for subsetting data frames. You might be able to use something along the lines of: mean(subset(brady.t, (G. == 1) & (Year != 2014), select = Yds)[[1]]) Basically, subset() is returning a data frame where Year does not equal 2014 and G. is equal to 1. The select argument is only returning the Yds column, which would otherwise be a list, so the [[1]] only returns a vector, which is passed to mean(). Regards, Marc Schwartz ______________________________________________ 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.
