Hello. I have checked the archives and have not found an answer. I am doing a MANOVA used data with a nested design. Can anyone explain how to specify different error structures in the manova function? For completeness, I have a design consisting of 4 blocks with 4 treatments per block (unreplicated within blocks). Each treatment is applied to a parcel from which a series of soil cores are taken. 24 different variables are measured on each core. I want to test for a block effect, a treatment effect and for differences between cores within each parcel. Any help or leads are appreciated. Bill Shipley Departement de biologie Universite de Sherbrooke Sherbrooke (Quebec) CANADA J1K 2R9 Bill.Shipley at USherbrooke.ca http://callisto.si.usherb.ca:8080/bshipley/ -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- 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 _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._