All Questions
12 questions
4
votes
1
answer
40
views
LMM for Repeated Measures tree ring chronology
Having my first go at R and stats.
I sampled and analyzed tree rings for different measures (width, density, etc.). There are 3 treatments, 3 plot per treatment, and 5 trees per plot. The ring time ...
- 71
1
vote
0
answers
158
views
Test for difference at each time point in panel data of long time series?
The easiest way to describe my question is perhaps with plots:
In this hypothetical data, each group has 9 subjects, and each subject's response is measured from time = 1… to 5. Is there a way to ...
- 63
1
vote
0
answers
95
views
Accounting for time with repeated-measures in lmer
I am trying to conduct a repeated-measures mixed-effects test with lmer and lmerTest, but I am not sure if I am doing it appropriately.
I have 6 sites with 3 plots per site that have been sampled once ...
- 11
3
votes
1
answer
327
views
Repeated measures regression or time series analysis?
I have managed to confuse myself again, so I hope you could give me some tips or point into the right direction.
I have pesticide residue data in different plant matrices (e.g. flowers, leaves) from ...
- 115
4
votes
1
answer
826
views
A correct mixed model for longitudinal data
This is a rather basic question and there are many similar questions here on CV. However, I could not find answers to my specific three questions below. My apologies, if I may have overseen something.
...
- 1,909
1
vote
1
answer
183
views
linear mixed effect models: random intercept, no fixed intercept interpretation
I'm learning about linear mixed effect models and I'm having a hard time interpreting a repeated measures model that has a random intercept, but no fixed intercept.
As an example:
...
- 337
2
votes
0
answers
628
views
glmer post hoc test at each time point
I have a question about post hoc tests for glmer. I haven't been able to find a solution on this site or in the documentation. My experiment looks at repeated measures of flower counts (Total) across ...
- 191
1
vote
1
answer
391
views
R - lme4 - Help on repeat measures over time, continuous predictor interactions
I've created an exmaple data set below to hopefully help answer a question in regards to a lme4 in R and measurements over time.
The data is 4 plots, measured over 4 years, with the dependent ...
- 11
6
votes
1
answer
2k
views
Including time as a continuous predictor and as a categorical random effect in mixed model
I am analyzing plant densities (n° of plants/0,36m²) across 5 different treatments (repeated on two blocks) in time (year and season). Since my outcome is plant density and repeated measures were done,...
- 311
1
vote
0
answers
234
views
Repeated Measures Mixed Model or Time Series? (Ecologist needing help)
I've been reading and researching for a while now but finally decided to directly ask. My data consists of the following:
Dependent variable: water-use measured daily over 1 year spanning three ...
- 11
4
votes
0
answers
2k
views
Testing for differences between time series with many timepoints
I think the easiest way to describe my question is with plots.
I've run an experiment where I recorded data from animals' brains (EEG) at 6 depths. The animals are recorded at baseline for 25 minutes,...
1
vote
0
answers
68
views
Mixed effects model for repeated measures to test for factors that are either constant or dynamic within an individual over time
I am dealing with a rather complicated dataset with repeated measures of the same individuals at various time points (samples were collected at different time points and different number of samples ...
- 11