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I am new to this forum. I try to find the appropriate model for the following data set with lme4:

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Each individual subject goes through 3 conditions ("Group", within-subject factor). These 3 conditions include 9 items (3 items in each condition, but the items differ in each condition). Score (4th column not represented above) is a continuous dependant variable (reaction time). I am interested in the fixed effect of the "Cond" variable and also would like to take into account the dependencies between my factors, but I have difficulties to know if my factors should be considered as nested or crossed. Does the following model seems correct to you ? Score~1+Cond+(1|Subject)+(1|item) Any help would be much appreciated.

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