Displaying 2 results from an estimated 2 matches for "wookie1976".
2010 Feb 23
4
First. Last. Data row selection
I am in the process of switching from SAS over to R. I am working on very
large CSV datasets that contain vehicle information. As I am processing the
data, I need to select the first (or sometimes the second) record (by date)
for any records that have the same license plate number. In SAS, there is a
function called 'first.' that can be used on sorted datasets to pull out
those first
2010 Feb 27
1
New Variable from Several Existing Variables
I am new to R, but have been using SAS for years. In this transition period,
I am finding myself pulling my hair out to do some of the simplest things.
An example of this is that I need to generate a new variable based on the
outcome of several existing variables in a data row. In other words, if the
variable in all three existing columns are "Yes", then then the new variable
should