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...level tables, in the relational database sense of "join". I have created a function to join the columns from two such frames according to the values of a key column. In relational database terms the key column must be a primary key for the second frame. I have called this function 'cjoin', by analogy to cbind. You can try data(MathAchieve, package = 'nlme') data(MathAchSchool, package = 'nlme') cjoin(MathAchieve, MathAchSchool, "School") cjoin(MathAchieve, MathAchSchool, "School", which = "Sector") as examples Several questions:...

...ggestions? I am considering this. Collect the co-ordiates from the circle points C1 <- draw.circle(3.5,7,0.8,border="blue",lty=2,lwd=2) C2 <- draw.circle(2.5,8,0.6,border="red",lty=3,lwd=3) Can I isolate the relevant arcs from C1 and C2? If I could, I'd join them Cjoin <- list(x = c(C1$x, C2$x), y = c(C1$y, C2$y)) And use that for plotting. pj -- Paul E. Johnson Professor, Political Science Assoc. Director 1541 Lilac Lane, Room 504 Center for Research Methods University of Kansas University of Kansas http://pj.freefaculty.org...