All Questions
14 questions
5
votes
1
answer
71
views
Is using a mixed model with random intercept and random slope appropriate for this problem?
I have a dataset with customer reviews of products and product features. Each customer reviews multiple products, but customers don't necessarily review the same products. The products are similar, ...
- 133
0
votes
0
answers
28
views
testing significance of random effects
I have a random effects model and I want to test whether they are significant or not. I'm using statsmodels.formula.api. I read I need to test whether the variance for a parameter is 0, but can't ...
- 133
2
votes
0
answers
40
views
How to compare the fit of two multilevel models which only differ in their fixed effects?
I have two models looking like this, where just the fixed effects differ, but the random effects stay the same
...
- 31
1
vote
0
answers
112
views
ICC vs Repeated Measures ANOVA to Justify Multilevel Model
I have heard of using ICCs to determine if there is variability to justify using a multilevel (i.e., mixed effects, hierarchical) model. However, I've recently seen studies examine whether there is a ...
- 21
3
votes
1
answer
1k
views
How to calculate "by hand" between group variance and the ICC for a three-level hierarchical model?
Introduction:
This question is related to this and this questions that were answered before, but I would like a more detailed answer on how between-groups variance are calculated in a (null) three-...
- 131
2
votes
1
answer
981
views
ANOVA with missing cells and multi-level analysis
I'm about to analyse some data (hypothesis testing) and would like some feedback on my approach as I have never seen this situation (missing cells in an ANOVA-like table). I would also like to know if ...
- 207
3
votes
1
answer
48
views
A figure or narrative to compare multi-level models and fixed-effects ANOVAs
TL;DR: What figure or narrative can represent a fixed-effect ANOVA if we represent $complete~pooling$, $no~pooling$, and multi-level (partial pooling) models using the following figures (and ...
- 4,056
1
vote
0
answers
30
views
Best Linear Predictors for two-way nested classification model
1. Summarize the problem
How can I make predictions for the random effects in a two-way nested ANOVA with unbalanced data?
Given the model for the two-way classification
$y_{ijk} = \mu + \alpha_j + ...
- 416
2
votes
1
answer
836
views
Two groups measured twice - which strategy is correct?
I could need some help on how to choose the correct way to analyze the data I have collected.
I conducted an experiment with two groups (control condition vs. experimental condition). The continuous ...
- 136
0
votes
0
answers
85
views
ANOVA over time but not repeated measures
I have an experiment that was incorrectly designed. I'm trying to see what analysis I should provide, but I'm a little confused.
A brief description of the experiment:
Rats were given one of four ...
- 2,692
1
vote
1
answer
939
views
Random Intercept Model: Will including Level 1 predictors necessarily reduce ICC?
Heck et al (2013) describe a process of building multilevel models that makes use of the concept of intraclass correlation (ICC).
They recommend calculating the ICC from a random-effects ANOVA
FIRST ...
3
votes
1
answer
1k
views
Mixed model vs. n-way ANOVA for hierarchical data and proportions
I have a experimental setup (plant germination). I don't have concrete data yet. I am looking at how many plants germinate in given conditions, broken down as follows:
1) Two different temperatures.
...
- 840
1
vote
1
answer
4k
views
AIC and anova p in multilevel model, how to interpret?
I have a model with a random-nested factor, I am comparing it with a model without the random factor (to test significance of random factor) as follows:
...
user91333
4
votes
1
answer
8k
views
Mixed ANOVA vs. mixed models (multilevel modeling)
Is mixed ANOVA the same thing as multilevel modeling? If not, how do they differ? I am trying to compare inter- and intra-individual differences and not sure which one is the better approach.
- 61