I am trying to caculate the standard errors of treatment means from an LME analysis. R gives me the coefficients of the model, from which I can calculate the means of a particular combination of treatments. It also gives me the standard error of each coefficients. How do I convert these into standard errors of the means. For example: Fixed effects: log(y) ~ log(x) + A + B + C Value Std.Error DF t-value p-value (Intercept) 0.2710230 0.08237595 471 3.29007 0.0011 log(x) 0.9126175 0.01905999 471 47.88131 <.0001 A 0.3712639 0.08057310 58 4.60779 <.0001 B -0.0772743 0.09460152 58 -0.81684 0.4174 C 0.2617046 0.06659040 58 3.93006 0.0002 X is a continuous variable, and A, B, and C, are two-level catagorical variables. I wish to know the SE of the fitted value of y when, say, x=5, A=1, B=2 and C=1. Can anyone help?? Many thanks Alex Shingleton *************************** * Alex Shingleton * * * * Department of Zoology * * University of Cambridge * * Downing Street * * Cambridge CB2 3EJ * * * * tel: 01223 331768 * * fax: 01223 336676 * *************************** -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._