color lines by group membership in spaghetti plot

Greetings,

I am new to R.  Right now I'm most interested in the spaghetti plots  
of achievement over time by student ID associated with longitudinal  
analysis.  How can I do a spaghetti plot of all students, but color  
the lines by group membership such as gender or race, and indicate  
this color scheme in the legend?  Any advice would be much appreciated.

I suspect this is more for R-help than for R-mac, but I suspect that:

function.for.spaghetti.plot(data, col = your.color.vector)
your.color.vector = a vector of color, of length equal to that of the students, where students that you want to have the same color (say student 1and 3) are coded as the same color (say 'red', 'blue', 'red')

Google spaghetti plots and R, it might prove helpful. And check the help for legend()

F


--
Federico C. F. Calboli
Department of Epidemiology and Biostatistics
Imperial College, St. Mary's Campus
Norfolk Place, London W2 1PG

Tel +44 (0)20 75941602   Fax +44 (0)20 75943193

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