[Gretl-users] Simple Data Problem - Person-Year

Hi, I'm brand new to using Gretl, but have lots of experience with Stata, SAS, and R. I'm trying to use Gretl to do something pretty easy, but can't seem to make it do what I want. Basically, I have a person-year data file such that each observation consists of a person in a given year. I'd like to be able to plot summary statistics by year or person for a person-year data set. In other words, if my data file was: Person,Year,Height,Weight 1,1990,60,150 2,1990,62,160 1,1991,61,170 2,1991,63,180 I'd like to plot Year on the X-axis and Height on the Y-axis, but plot the yearly average as a line (I.e., point A=(1990,61); point B=(1991,62)). With more extensive data, I'd like to add in lines for standard deviation, etc. Thanks in advance.