[R] Exclude 2014 data from mean

[Adam Jauregui]

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

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