Questions tagged [nested-models]
One model is "nested" in another if it is a constrained version of it. Nested models can be compared with a likelihood-ratio test. Use this tag for questions about comparing non-nested models too.
186 questions
1
vote
1
answer
35
views
+100
Propensity Score Weights for nested observations
I'm studying whether a private tutor increase kids learning outcomes.
I have a database of kids: each row is a kid. Some of them had the private tutor, some of them didn't.
I matched the kids on the ...
- 3,355
1
vote
0
answers
25
views
Weighted quantile sum (WQS) and Cox model
I am working on weighted quantile sum (WQS), and I know that the WQS index obtained represents the effect of the mixture on my outcome.
In order to know which effect the mixture has on my outcome in ...
- 11
0
votes
0
answers
19
views
Would a nested contrast work to look at the effects of a variable that has only some values specified and the rest are NA?
I have a dataframe where I'm studying the effects of a variable, say Word Type (with levels A,B,C,D) on reaction times (RTs). I have manually set treatment contrasts that compare each of these levels ...
- 11
3
votes
1
answer
76
views
handling pseudoreplication in lmer, repeat measures over time that includes duplicate repeat measures
Wondered if you could help me out here on a common setup found in microbial data (measuring colony forming units, or CFU's).
In this synthetic dataset microbe containing samples are taken over time, ...
- 61
0
votes
0
answers
45
views
Model(s) for paired and nested experiment
I am planning a field experiment consisting of reducing the population of a predator species to evaluate how this would affect the abundance of its prey species. As you can see in the image below, the ...
- 1
0
votes
0
answers
60
views
Comparing nested models using bootstrap
I am working on my master thesis and have a dataset with multiple projects. The project type is defined by a categorical variable.
I am using two modeling approaches: linear regression and Random ...
5
votes
2
answers
363
views
Significance testing from random slopes model
I'm trying to explore some operating characteristics of the random slopes model. In this context, we are thinking of a clinical trial with subjects randomized to one of two arms. I fit the below model ...
- 67.6k
2
votes
1
answer
143
views
Nested models and Hilbert space
Recently, in my GLM course, we analyzed linear regression from a more philosophical perspective using Hilbert spaces. My teacher suggests that we be careful when when two models are "nested.&...
- 311
1
vote
1
answer
141
views
Simpler model has better fit
I am comparing two models, one of which is nested with respect the other. On occasions, the nested model (i.e. with fewer parameters) has a smaller RSS value (implying that it fits the data better, ...
- 107
3
votes
1
answer
126
views
Why do I need a nested rather than two separate random effect(s) when accounting for pseudoreplication in the presence of repeated measurements?
I have a dataset from individuals, where measurements of different urinary biomarkers have been taken on two study visits:
Subject ID
Value
Visit
Biomarker
Predictors 1-10
1
1.2
1
A
1
1.4
2
A
1
1.5
1
...
- 33
1
vote
0
answers
43
views
How to Handle a Dependent Variable in a Fractional Factorial Design of Experiments (DOE)?
I am designing a fractional factorial experiment with five quantitative variables. However, two of these variables are dependent on each other. Specifically:
One variable represents the amount of an ...
- 31
0
votes
0
answers
38
views
How can I add a nested factor into aligned rank transformation model
I am trying to add in a nested factor of individual ID into my model using aligned rank transformation (from the R ARTool package) so I can run ANOVAs. So far I have not had much luck in getting ID ...
5
votes
1
answer
154
views
Fitting separate LMMs for different interactions
I am analyzing longitudinal changes in a major clinical scale for depression symptoms (DV) using a linear mixed model (LMM). My full model included:
...
- 471
2
votes
0
answers
94
views
Nested design with fixed and random effects: Is my R model correct?
I am trying to analyze a nested experimental design in R, but I am unsure whether I am approaching it correctly. I have a following data:
Set
Sample
Repet.
Response
1
1
1
y1
1
1
2
y2
1
2
1
y3
1
2
2
y4
...
- 31
0
votes
0
answers
56
views
How to use mlogit for models where there are no choice specific variables
Suppose one wants to model choice of product among two cellphones and two colors, but cellphone 1 only comes in red or green while cellphone 2 only comes in blue or black. So there is a nesting in the ...
