multilevel model

  1. L

    lmer multilevel model

    Hi to all, I want to look at the change in the percentage of income savings measured in dollars using repeated measures data for older adults. I want to compare three groups based on their father's occupation while growing up. I want to estimate different slopes and intercepts for the...
  2. E

    2-Step Mediation With Multi-level Data

    Hello, I have data in which each participant responded 5 times to some questions. We want to run a mediation model in with X --> M1 --> M2 --> Y, but we want to account for the fact that M1, M2 and Y are nested within participants. Can anyone help? Thanks in advance!
  3. C

    Difference between two lmer model .

    Can you please explain where is the difference between the following two models : fm1 <- lmer(Reaction ~ Days + (Days | Subject), sleepstudy) fm2 <- lmer(Reaction ~ Days + (1|Subject) + (0+Days|Subject), sleepstudy) I noticed there is some discrepency in the estimate for random effect...
  4. C

    Interpretation of various output of "lmer" function in R

    library(lme4) fm1 <- lmer(Reaction ~ Days + (Days | Subject), sleepstudy) The notation `(Days | Subject)` says to allow the intercept and `Days` to vary randomly for each level of `Subject` . Can you please explain me the result of the following commands ...
  5. A

    Transitioning from HLM (program) to R for Multilevel Modeling - Help!

    Hello! Thank you for reading and a big thank you if you can help. My goal is to successfully run this type of model in R. I know how to set up the dataset and interpret the results using HLM (the program) but I am completely lost when trying to get it into R. Screenshot of the model is...
  6. N

    Which multilevel approach is the right one? Help needed choosing a method.

    Hi everyone, I have a data set with a very specific structure and I am looking for a suitable way to analyze it. To be more precise, I am considering cross-classified multilevel modeling or multiple membership modeling. However, I am facing great difficulties understanding the exact structure...
  7. S

    Is this logit model a multilevel model, and what is the correct way to model it?

    I am analyzing a sample of about 6000 actions carried out by about 500 multinational companies in about 80 countries during a 6 year period. Actions are carried out randomly, and are not longitudinal measurements for the same multinational over time. The actions can be of two types (A or B). My...
  8. B

    Random Sampling in Mixed Models

    Hi, I have a data set that contains 40 firms over 15 years with firm and individual level data, with the individuals being sample randomly from each firm over 15 years. There are time invariant variables at the firm level and the panel design is unbalanced. How should I be looking to treat my...
  9. W

    interpreting multi-level logit model

    Hi, I posted this in the psychologiy statistics forum as well, but haven't gotten a response. I thought maybe it would fit better here. I have this output from Stata (an explanation of the variables follows). As far as I understand, the policyfoundation coefficient is statistically...
  10. trinker

    Understanding Multilevel Model

    I'm slowly working through multilevel models and have a pretty specific question/though checking. Here's some R code: library(lme4); data(Dyestuff) mod <- lm(Yield ~ 1 , Dyestuff) resid(mod) This is a called a null model correct? This is because you're predicting the outcome...
  11. trinker

    Can fixed effects models deal with nested data?

    I'm reading a paper now: English teacher candidates developing dialogically organized instructional practices (2013) [there's five authors so I'm not going to put the full citation] The authors state (LINK to a photo of that page): This is nested data (level one lesson plan, level 2...
  12. Lazar

    Predicting Random Slopes

    I have a model as follows: Level 1 (students): Variables = educational aspirations (expect) and socioeconomic status (ses) Level 2 (schools): not interested in this level just controlling for it Level 3 (countries): Variables = educational equity (ICC) the models is...
  13. trinker

    Guidance on HLM/multilevel modeling

    I've decided I need to know multilevel modeling; no way around it in educational research. I can't take the class at the U because it's offered bi yearly (missed it this last Fall). So I need to take it else where and/or learn it on my own. I'm hoping to rely on other people's experience here...
  14. L

    modeling temporal variation

    Hi I have 6 years of patient-level data and I'm using a hierachical (2-level) regression model. Could anyone suggest ways to model the temporal change in hospital-level variation in patient outcomes, in a multilevel model ? So far, my approach has been to run the model on separate years of...
  15. J

    Linear mixed model without random or repeated effects? GLMZ?

    Hi, I'm working on a dissertation, of which many chapters have longitudinal data and I've been using linear mixed models to estimate growth. I also have some non-longitudinal data (i.e. cross-sectional) that I'd like to estimate growth with in a similar way. The cross-sectional data spans a...