# Tagged Questions

32 views

### How to determine effect of random factors and slopes and their variance in Mixed Model

I would like to determine the variance explained by random factors and slopes in a mixed model but am unsure if the analysis I use and my interpretation are correct. Furthermore, comparing models and ...
26 views

### Is there a one-tailed test for difference in data variance in a mixed model?

I would like to test if the variation of my response variable is higher for one level of an explanatory variable than for the other. However I am not interested in the total variation, but only ...
109 views

### Relative variances of higher-order vs. lower-order random terms in mixed models

TL, DR summary: Is there any theoretical or empirical basis to support the following statement being true as a general rule of thumb? "When estimating a mixed model, typically the estimated ...
45 views

### Explained variance in linear mixed effect model

Do anyone know a R function (or another way) to get the proportion of explained variance by each one of the fixed effect factors in a linear mixed-effects model?
33 views

### Test for equal variability in mixed model setting

I have a setting where I normally would model the variability in measurements by a linear mixed model which would look in R as follows. ...
113 views

### Error with RLRsim package while testing for variance components

I am trying to fit the mixed effects model and test for a variance component using RLRsim package. $$Y_{ik} = \alpha + \mu_{k} + \beta G_{i} + Z_{k}G_{i} + b_{i} + \epsilon_{ik}$$ Random ...
168 views

### What does the residual higher level variance tell me?

I have a multilevel logistic regression model predicting the probability of item nonresponse, where the random intercept variance at country level takes on the following distribution for the different ...
248 views

### using a number of variables (dummy) in mixed model analysis in R

I have following type of data: ...
792 views

### Proper use of weights argument in linear mixed model [lme()]?

After attempting to produce a linear mixed model I was left with a great deal of heterogeneity. ...
194 views

### What to do with heterogeneity of variance when spread decreases with larger fitted values

I am trying to produce a linear mixed model the R code is as follows. lme(Average.payoff~Game+Type+Others.Type+Game:Type+Game:Others.Type+Type:Others.Type,random=~1|Subjects,method="REML", ...
553 views

### Can I use generalised least squares with a binomial distribution and a nested structure?

I'm trying to fit linear models to my data in R. I need to use a generalised least squares method as I have heterogeneity of variance in one of my variables. I was planning to use varIdent, as the ...
791 views

### Variance on the sum of predicted values from a mixed effect model on a timeseries

I have a mixed effect model (in fact a generalized additive mixed model) that gives me predictions for a timeseries. To counter the autocorrelation, I use a corCAR1 model, given the fact I have ...
869 views

### Variance explained of a mixed effects model in a new data set

I'm using the following function to calculate Edwards R^2 (formula 19 in Edwards et al. 2008) of a mixed effects model (I hope the implementation is correct): ...