I have a data with the variable id as a unique origin point, and the variable distance_km that tells us the distance to the nearest point of interest. I need to a better way classify each id as being ...

I am trying to find out if 3 datasets (df1, df2, df3) have any common rows (i.e. entire row is a duplicate). I figured out how to do this for pairs of 2 datasets: df1 = data.frame(id = c(1,2,3), names...

I'm attempting to make subsets of a large data frame based on whether the column names are in an externally defined set. So I'm starting with something like: > x <- c(1,2,3) > y <- c("...

I have a dataset in longformat that contains both visit and measure dates for each ID. What I want is to remove the duplicate visit dates for each ID conditionally, namely: IF visit date - measure dat...