Note on input data (voter.file) columns names

[Mark-Bergn]

Hello, I was running into an issue where I could not run the predict_race() function. What triggered the error was the line of code "colMeans(df[, grep("c_", names(df), value = TRUE)], na.rm = TRUE)" in the merge_names function. I realized that I had a column of "Associate IDs" (named assoc_id) which it was trying to include in the colMeans function. I'm not sure if there is a good solution but I think adding a note or warning to be sure your input data set does not include any columns with "c_" in their name would be helpful.

[dwillis]

Yeah, would like to second documenting this.