(This article was first published on Quantitative Ecology, and kindly contributed to R-bloggers)
A quick function that when provided a numeric vector of years returns a boolean vector where TRUE == Leap year.
is.leapyear=function(year){
#http://en.wikipedia.org/wiki/Leap_year
return(((year %% 4 == 0) & (year %% 100 != 0)) | (year %% 400 == 0))
}
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Zero Inflated Models and Generalized Linear Mixed Models with R.
Zuur, Saveliev, Ieno (2012).
