Matching and merging 2 files is task I find myself doing all of the time. Historically, I've used VLOOKUP in MS Excel and just worked around any limitations. Finally, I bit the bullet and wrote an R Function that does the trick faster, and with more flexibility. (Image added by the Editor, source) What is a VLOOKUP? Before we get into it, let's look at how Excel's VLOOKUP function works so it i…
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