Why not merge on ID, then delete the rows that don't match your second
criterion? Seems easier than trying to do it in one step.
Sarah
On Mon, Jul 20, 2009 at 3:07 PM, tathta wrote:
>
> I would like to merge two dataframes, but i have a condition that needs to
> used for the merge as well.
>
> th
I would like to merge two dataframes, but i have a condition that needs to
used for the merge as well.
the rows (observations) in each dataframe are identified by each person's ID
and by the date of the observation.
Basically I would like it to be merged based on both ID (exact match) and
date
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