How to handle tags list in one column of a csv file

[mfherman]

Ah yes, that can be a difficulty with using spread. There is a good discussion with some workarounds here that should help:

Spread- why errors

Many times I get the following error message when I use the spread function: "Error: Duplicate identifiers for rows" and inevitably have to use dcast. Why does dcast work and spread kick back errors when I use the same data set?