multilevel model

I'm using multiple waves of the United Kingdom Household Longitudinal Survey (also known as "Understanding Society Survey") and want to use mulilevel models to explore change in health within individuals and between individuals. As far as I understand using a simple two-level model would mean...

Trying to get some input on my below process/method to validate a prediction model! I have a sample of 200 peoples' dependent variable (positive continuous lab value) and days since an exposure (independent value). I fit a GLM with dist=gamma and link=log. From this I get a model coefficient...

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...

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!

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...

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 ...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...