[Gretl-users] Re: Histogram with two variables

Many thanks, Sven and Riccardo. You have given me much to work with. The data I am working with is indeed discrete. One of the two series has a fairly tight standard deviation, and the other does not. This does bring about an issue that I believe Riccardo mentioned: the number of "bins" for both. If I choose the same number of bins, but one series has a much tighter standard deviation, then overlaying the two will look odd, since the frequency distribution which is tighter will have much smaller bins, resulting in a picture with two sets of bin sizes. I played around with the R version of this and saw that in order to get the bins to look uniform in size, I'd have to choose only two or three bins (R command for this is "breaks") for the tighter variables and upwards of 52 bins for the more volatile series. I'm guessing there's a nice relationship that can be formalized where you can pick the number of bins for one series and the second series' number of bins should then be a function of the first series' standard deviation.