[R] Delete observations with a frequency < x

[mathijsdevaan]

Hi,

I have two columns with data (both identifiers - it's an affiliation list)
and I would like to delete the rows in which the observations in the second
column have a frequency < 5 in the entire second column. Example:

1     a
1     b
1     c
2     a
2     b
2     d

Let's say, I would like to delete the rows in which the observation in the
second column has a frequency < 2 in the entire second column. This would
result in:

1     a
1     b
2     a
2     b

How can I do this? Thanks in advance!

Mathijs
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