[R] Split dataframe by year

[Rich Shepard]

On Mon, 10 Feb 2014, Zilefac Elvis wrote:

> I have a dataframe in R and would like to split the data (1900-1980) into
> two sets. For example, one dataframe should have data from 1900-1960 and
> the other from 1961-1980.

   If you want two separate dataframes (while leaving the original), subset()
based on the year. For example, one dataframe would select year < 1961 and
the other new dataframe would select year > 1960.

Rich

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