mixed effects

  1. V

    Interpreting Mixed Effect Logistic Regressions with Interaction Effects

    Hello, I need to interpret mixed effect logistic regressions, but I do not quite understand how I can go about doing this when an interaction effect is involved. My main aims involve determining whether metabolic syndrome is associated with decreased mental health-related QoL (low MCS) over...
  2. I

    Correcting for regression to the mean in mixed effects model of longitudinal data?

    Hey everyone, I know you can correct for regression to the mean for two time points, in a before and after scenario. But does anyone know how to do this when there are more than two time points, let's say there are about 10 points in a time series. I was hoping to model the longitudinal data...
  3. S

    Mixed effects logistic Regression

    I have what I believe is a mixed effects logistic regression. My outcome is injury (y/n) and I have subject level (age, gender, smoking) and Class level ($ Funds, instructor experience, etc.). I am trying to preduct injury based on the subject AND class level data. My outcome is by subject...
  4. S

    Logistic Regression with Mixed effects

    I have a logistic regression setup: Outcome = injury (y/n); predictors that are subject specific are gender, age, smoking, and predictors that are class level are $ funds, instructor experience, etc. I want to be able to predict injury based on the subject AND class level data. My setup is...
  5. J

    Correct interpretation of Lmer output

    I have produced the following model lmer(TotalPayoff~PgvnD*Type+Type*Asym+PgvnD*Asym+Game*Type+Game*PgvnD+Game*Asym+(1|Subject)+(1|Pairing),REML=FALSE,data=table1)->m1 PgvnD=A percentage (numeric) Asym= a factor 0 or 1 Type=a factor 1 or 2 Game= a factor 1 or 2 from this model the terms...
  6. C

    Difference between MCMCsamp and sim

    Trying to get confidence intervals on a fixed effect in a mixed model fitted with the lmer function in package lme4 in R. I can get distributions of beta using "mcmcsamp" function and estimate a confidence interval from that, but I can also do it using "sim" in the package arm. While they both...
  7. J

    Lack-of-fit for repeated measures

    Greetings, I'm looking to run a lack-of-fit test on repeated measures data. To summarize my problem, I want to test whether an eight-factor regression model fails to adequately predict 15 (nominal) condition means (measured in response times). Thus, each participant has an observed mean score...
  8. A

    Mixed effects modelling help!

    Hi, I am new to mixed effects modeling and was wondering if someone could help me out. I have a data set in which 500 participants have a baseline visit and a 6 month follow up. I want to see the effect of changes in factor a, b, and c are on outcome x. However I have to exclude about 100...
  9. geotheory

    Comparing Mixed Model results with OLS regression

    Hi there. I'm an inexperienced an entirely self-taught statistician fighting a huge deadline. I'd be most grateful for advice! Background: I've been working on fitting an HLM model that explores the spatial relationships between crime and socio-economic factors such as deprivation scores...
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    Problem with mixed effects model with binary data

    Hi guys, I have a question about logit mixed effects model. I tried to use lmer to fit a model with binary dependent variable (Yes or No), a categorical fixed predictor with 3 levels, and two random effects. However, it turned out that one level of the fixed resulted in only positive outcomes...