Hi Sandra,
Terribly ugly, but this way at least you don't have to know which years are
missing, etc.:
dat <- data.frame(year = c(1981,1984,1985,1986), size = c(1,2,3,4))
year_ <- data.frame(year = seq(1981,1986,1))
year_dat <- merge(year_, dat, by = "year", all=T)
na_s <- subset(year_dat, is.n
What you want to do is create a new dataframe that includes all the years.
> newdata <- data.frame( Year=1981:1988 )
> merge(fire, newdata, all=TRUE)
If you don't include the all=TRUE, then you only get the rows that are
contained in both datasets.
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