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...so, should I take mod1 (mod1 <- dT_purs ~ T + Z + (1 + T | subject ) instead of mod2 to fit my data? Why are these results contradictory? Finally is a correlation value of -0.87 a too high or an acceptable value ? Thanks for help me in advance! Best Benedetta --- Benedetta Cesqui, Ph.D. Laboratory of Neuromotor Physiology IRCCS Fondazione Santa Lucia Via Ardeatina 306 00179 Rome, Italy tel: (+39) 06-51501485 fax:(+39) 06-51501482 E_mail: b.cesqui@hsantalucia.it [[alternative HTML version deleted]]

...r overall responses, but also in the nature of their response dT_purse values in the different T conditions, but not in the different Z conditions. Benedetta -----Messaggio originale----- Da: ONKELINX, Thierry [mailto:Thierry.ONKELINX@inbo.be] Inviato: lunedì 25 novembre 2013 14:48 A: Benedetta Cesqui; r-help@r-project.org Cc: r-sig-mixed-models@r-project.org Oggetto: RE: [R] lmer specification for random effects: contradictory reults Dear Benedetta, I think you might want (1+T+Z|subject) as random effects rather than (1+T|subject) + (1 + Z|subject). The latter has two random intercepts per s...