Displaying 1 result from an estimated 1 matches for "tp1596777p1596853".
2010 Mar 17
2
How can I return rows from a data frame with maximum value by factor?
Hi,
I'm new to R and new to this forum. I'm struggling with trying to extract
certain rows of data from my data.frame. The data.frame has eleven columns.
Among those columns are "FISH_ID" and "DATE_TIME". FISH_ID is a factor. For
each of my 21 unique FISH_IDs (levels) I have a few to a few thousand rows,
each row with a unique DATE_TIME value. I would like to obtain,