David, Thanks for responding. You were right; I misplaced a backspace (\) with a forward space (/) in my posting. The c:\ doesn't actually work; in my true code there is a forward space.
Anyway, the results of str(data) appears as follows: 'data.frame': 90 obs. of 9 variables: $ Fish (PCOrd) : Factor w/ 90 levels "Fish1","Fish10",..: 1 2 3 4 5 6 7 8 9 10 ... $ Location : Factor w/ 10 levels "16","18","24",..: 4 4 4 10 10 4 4 4 4 4 ... $ Treatment : Factor w/ 2 levels "RES","UN": 1 1 1 2 2 1 1 1 1 1 ... $ Treatment Location : Factor w/ 3 levels "IN","TOP","UN": 2 2 2 3 3 2 2 2 2 2 ... $ Fish Length (cm) : num 7.8 6 7.1 6.6 7.2 6.6 6.4 6 6.15 5.7 ... $ Fish Weight (g) : num 5.72 3.27 4.46 3.57 4.78 3.41 3.3 2.3 2.42 2.4 ... $ Dried contents : num 0.024 0.0349 0.017 0.0254 0.0456 ... $ Combusted contents : num 0.00203 0.00282 0.00155 0.00226 0.00353 ... $ Estimated content mass: num 6.66e-05 2.91e-03 7.45e-03 1.28e-02 5.46e-03 ... > Any thoughts now? ______________________________________________ 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.