search for: shadedcorr

Hi All, Here is something that sounds simple, but I'm having trouble getting it. I have a data frame with two columns, the first is date and the second is employee ID. I'd like to plot date on the horizontal axis, employee ID on the vertical axis, and the number of times the employee appears for the given date as a color. I've kluged something where I make a table (table(date, id))