All, I've read several tutorials re: generating wireframes, but am clearly missing something. I have data along the lines of:
> tbl [1:10,] Visits Activity Course.Grade 1 17 2 18.31 2 7 11 20.67 3 9 17 24.69 4 28 71 38.72 5 43 107 45.46 6 14 5 47.77 7 25 51 57.81 8 32 27 59.46 9 60 43 64.39 10 31 46 66.26 When I run the command: wireframe(Course.Grade ~ Visits * Activity, data = tbl) I get an appropriately labeled, but empty, cube. Can anyone tell me why there's no data in my cube? Thanks in advance, David ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
