mixed effect model

  1. J

    How to extract coefficients corresponding to data from each time in a mixed effect model in R?

    I am not good at statistics and might have a naive question. Any help is appreciated. Here is the simplified question: Patients received two different vaccines twice and we collected their blood after each vaccination to measure antibody levels in the blood. There are other variables but here I...
  2. W

    Change score an independent variable in mixed model

    I have an (ordinal) outcome measured at two time points, baseline and year 1. My colleague is interested in how our exposure variable is associated with the outcome after adjusting for a number of covariates captured at baseline. However, our exposure variable is a percentage change from...
  3. H

    Is this group of data different from the rest: From ANOVA to...

    Hi! We have performed an experiment to see if semi-wild pigs have any food preferences (in what type of nutrient supplement we add to the food). Different foods were added in their home range at each their place. After each trial we counted the number of food pellets that were eaten. So...at...
  4. C

    Help needed with Repeated Measures ANOVA - how to correctly specify nested effect?

    Hi everyone, I need some advice regarding nested effects. My data set has the following variables: HeatingRate = dependent variable Individual (n = 4) = fixed Temperature gradient (n = 3) = fixed Trial (n = 3 per temperature gradient per individual) = random I'm interested in knowing whether...
  5. D

    Problem with repeated-measures GLMM in SPSS for psycholinguistic study: Failure to converge

    I'm trying to run a generalized linear mixed model in SPSS, with a continuous response variable (ResponseTime), SubjectID as a random factor, Items as a repeated measure, and five fixed factors: three categorical subject variables (Sex, Handedness, Familial Handedness) and two categorical item...
  6. R

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  7. S

    Basic doubt - dummy code vs. hierarchical model

    I have a basic doubt on when to use country code as dummy coded control variables in regression and when to model it as a higher level variable within which other independent variables are nested. In my specific study, I have borrowers from several countries using an online P2P portal for...
  8. S

    Mixed Effect Model in SPSS

    I keep getting error messages:' The levels of the repeated effect are not different for each observation within a repeated subject.' Can anyone offer me some advice whether I can perform Mixed Effect Model in SPSS with my data or I have organised my data correctly? I have two groups of...