search for: tp3604352p3604713

I am new to R and am having difficulty merging 2 data sets, both of which have the same 30 variables and about 2,000 records. I've looked high and low—Paul Johnson's help page, through some of the 5,420 (yikes!) results for “merge” on the R list archives, and google searches—and I'm getting nowhere, so I thought I'd ask. When I try to merge by the ID variable: >