Displaying considerable ignorance. I need to do a post hoc comparison of regression slopes. I've used lm(response ~ factors/predictor -1) and have a nice anova table with slopes and standard errors, and I could contrast the slopes with a cludged t-test (they are massively different and awful liberties could be taken), but is there an elegant, prebuilt method somewhere? Thanks, Richard Rowe Richard Rowe Senior Lecturer Department of Zoology and Tropical Ecology, James Cook University Townsville, Queensland 4811, Australia fax (61)7 47 25 1570 phone (61)7 47 81 4851 e-mail: Richard.Rowe at jcu.edu.au http://www.jcu.edu.au/school/tbiol/zoology/homepage.html