Tagged Questions
0
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0answers
42 views
Is my random variable affecting my response?
I performed an experiment on coral colonies (10 colonies, randomly chosen in repeated measurements); manipulating aragonite/carbon chemistry and temperature (fixed effect) to analyse effects on the ...
1
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0answers
62 views
Repeated Measures in R, SAS or SPSS: Whale Body Temperature Data
I have a question regarding a repeated measures experiment. I have 5 whales (randomly selected) that I recorded body temperature on. Data was collected via satellite, programmed to transmit records at ...
2
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0answers
26 views
Repeated measures ANOVA in R for non-orthogonal design
I have data from a two-factor within-subjects experiment design where the conditions are not orthogonal. Factor one (Location) has three levels; factor two (Stimulus) has three levels, one of which is ...
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0answers
21 views
Specifying a correct full model for an unbalanced repeated measures design in R lme4
Recently, I have done a fairly complex experiment, and I am having trouble coming up with a model that is suitable for the data. I have spent a few days reading about, e.g., when random effects should ...
3
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2answers
113 views
Using lmer for repeated-measures linear mixed-effect model
EDIT 2: I originally thought I needed to run a two-factor ANOVA with repeated measures on one factor, but I now think a linear mixed-effect model will work better for my data. I think I nearly know ...
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1answer
37 views
Repeated-measures error in R ezANOVA using more levels than subjects (balanced design)
I'm having a problem running a repeated-measures ANOVA in R using the ezANOVA function.
I have data from 18 subjects - each subject participated in 3 conditions, ...
2
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1answer
45 views
What factor (trials or blocks) to use in a repeated measures ANOVA
I am conducting a psycholinguistic experiment. Each trial consists of the subject responding to a word by pressing a button.The design of my experiment is as follows:
5 blocks of a 100 trials each ...
3
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0answers
101 views
Multilevel modeling of experimental data with repeated measures in the same condition of factorial experiment
I'm struggling with modeling some experimental data using the lme4 package in R, and would appreciate input.
My experimental design is as follows: subjects ...
1
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1answer
81 views
Lmer model design
My data is a series of repeated measures in time (14 measures). I am trying to model the variable HbA1c which is a blood test performed at each visit to measure the ...
2
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0answers
39 views
Pretest-posttest plus control design
I am evaluating the effect of an intervention (treatment: a lecture) on the ability to spot behavioral clues of emotions using visual stimuli using pretest-posttest plus control group experimental ...
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1answer
53 views
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0answers
28 views
How can I analyse results from a repeated in repeated measures mixed design in r
I want to investigate performance in a learning test, where my test animals have been submitted to a number of trials within test day over several test days. I want to investigate if there is an ...
0
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1answer
320 views
Post Hoc test for between subject factor in a repeated measures ANOVA in R
I have done an experiment of how different animal species affect nutrient fluxes in sediments. I had a number of experimental units (sediment boxes) to which different animal species were added. I ...
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2answers
171 views
One-way repeated measures anova
I tried finding an answer to this question on this and other sites but to no avail - if I am missing something please excuse my inability to locate the answer!
Basically I have several dependent ...
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0answers
108 views
two way repeated measures anova random factors missing data
I have a pretty simple time series experiment that I'd like to analyze in R. I have an experimental and control group and for each individual in each group I collected samples from them over a course ...
3
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1answer
173 views
Error term in repeated measures ANOVA in R
I am having problems with defining the error terms for a two way repeated measures ANOVA in R. My data consists of wood density estimates for three radial positions (inner, middle, and outer) along a ...
3
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0answers
109 views
Specification of error terms in aov() in R
For a two-way repeated measures design, we can specify the model using aov in the following fashion:
...
1
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1answer
102 views
r mixed models repeated measures
I am trying to analyze the results of a trap study to determine how climate and trap type affect capture success as measured by the number of animals captured per trap/day. This has lead to an ...
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0answers
214 views
How to interpret R output for two-way repeated measures ANOVA
How do I interpret the following output from R for a two-way repeated measures ANOVA
...
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1answer
113 views
Between subjects repeated measures ANOVA in R - 5 brands, 11 measurements
In my research I have performed a series of measurements on 5 different brands of blocks. Each block has been inspected for deformation under incremental forces (20, 30, 40, 50, 60, 70, 80, 90, 100, ...
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0answers
134 views
How to construct GLMM model for repeated measures with binary responses with lmer
In my experiment I assigned subjects to one of the 3 treatments A, B or C. Within each treatment, a single subject was tested with two models sequentially. The test sequence was randomized. The ...
4
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1answer
414 views
Post-hoc test after 2-factor repeated measures ANOVA in R?
I have problems finding a solution regarding how to run a post-hoc test (Tukey HSD) after a 2-factor (both within-subjects) repeated-measures ANOVA in R. For the ANOVA, I've used the aov -function:
...
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0answers
38 views
Repeated measures + blocked
I think my design is blocked (or split-plot?) repeated measures, but I'm having trouble getting it set up just right.
I have 5 Areas.
Each Area is composed of 3 Swaths, each with one of three ...
1
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1answer
147 views
Significance of the component in a multivariate linear model (“within-design”)
I'm trying to test the significance of the "component" effect in a multivariate regression model. I'm not sure what is the right way. Using R, I have tried a way with ...
3
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1answer
246 views
Analyse unbalanced repeated measures 2x2x2x2 type II anova interactions
I have a run an unbalanced 2x2x2x2 Type II ANOVA in R and am having trouble following up on the results. Here is the output:
...
2
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0answers
82 views
Nested repeated measures analysis
I have a nested repeated measures question. I have 20 individuals grouped into 5 families. For each individual I have measurements on subsequent days pre, during, and post-treatment for a total of 6 ...
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0answers
103 views
Unbalanced, non-parametric repeated measures anova
I have an unbalanced repeated measures design with low sample sizes (n=3 for treatment, n=5 for control). Everyday for eight days I measured a response (in percent); however, because of the nature of ...
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0answers
177 views
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281 views
Step-by-step mixed model analysis in R using lme, ezANOVA, or aov
My data consist of 4 treatments (fixed), 8 locations (2 locations per treatment), 3 positions (per location, fixed), 3 samples (per location, random), with dependent variable ...
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1answer
695 views
Nested/SplitModel - RepeatedMeasures/MixedModel ANOVA: levels of nesting & scripting in R
My data set has the following variables:
Treatment (4 types- fixed)
Location (8 locations- fixed)
Position in Location (3 positions per location- fixed)
Samples are taken in each position (3 ...
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1answer
131 views
Question with R and repeated measures
Second time I'm turning to this site, it has helped before. I am looking for some coding help to perform a repeated measures anova in R. I have a total of 4 treatments, each replicated 3 times. They ...
2
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0answers
132 views
Use of nlme for mixed models of repeated measures with two classifying factors and a covariate
Suppose we have a mixed model for repeated measures with response being $y$ and a covariate being $x$(say, age). There are two classification factors $a$ and $b$. Say, 5 psychological patients($a$) in ...
3
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1answer
301 views
Contrasts in repeated mesures ANOVA in R
I am a refugee from SPSS in the process of re-learning how to do everything in R. Mostly it's been fun, as R is great for a lot of things but I've run into a snag that I can't seem to find a solution ...
5
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0answers
273 views
simple repeated measures syntax - lme vs. lmer
I'm trying to look for significant effects on "similarity" (of "isinpair" and controlling for time effects) using repeated measures with an in group sample. The intervention "isinpair" occurs after a ...
2
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1answer
133 views
How to calculate chi squared from mauchly of R's ezANOVA output?
I'm working through Andy Field's Discovering Statistics with R and in the repeated measure's section he shows how to calculate Mauchly's $W$ using ezANOVA from the ...
12
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1answer
390 views
Is there an R package for continuous time longitudinal binary responses?
The bild package appears to be an excellent package for serial binary responses. But it is for discrete time. I would like to specify a smooth function of time ...
3
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0answers
119 views
Repeated measures interaction betwen SNP and treatment with R
This is my first question is this forum. I have the a problem that I want to solve with the lme function of the nlme package of ...
3
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1answer
500 views
Using lme to analyse a complete randomized block design with repeated measures: Is my model correct?
I've got a completely randomized block design with three treatments and four replications. Biodiversity was measured in four successive years.
I figured that a mixed model with repeated measures as ...
5
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1answer
249 views
Repeated measures: aggregate, fixed effects, or random effects?
I have a repeated measures design with data collected across 8 treatments, with 5-6 repeats for each treatment in closely spaced time intervals (time is not important in the study). I only have 4 ...
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3answers
296 views
Logistic regression with repeated measures?
I would like to make a prediction for a (new) subject to have a certain outcome given the historical data and the model:
...
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0answers
263 views
Repeated measures ANOVA, unbalanced and missing values in R
I have chemical compositions of individuals collected in 6 different sites in monthly intervals over a period of 6 months.
I would like to determine whether there is significant variation among ...
0
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1answer
138 views
Comparing means - 2 repeated measures variables, controlling for covariate with heterogeneous slope
I have a 2 level repeated measures DV of accuracy, and a covariate of response bias. As response bias increases, accuracy level 1 increases while level 2 decreases. I want to see if there is a ...
0
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1answer
1k views
Linear regression with repeated measures in R
I was unable to figure out how to perform linear regression in R in for a repeated measure design. In a previous question (still unanswered) it was suggested to me to not use ...
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0answers
280 views
Split plot design with repeated measures in package (nlme) - model errors
Forgive me if this answer is already somewhere on this site, but after extensive searching I have found nothing to help me. Here is a brief overview of the experiment:
I have 18 tanks, each of which ...
2
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0answers
61 views
How can I test for significance of a treatment in an unbalanced, repeated-measures experiment using R?
CrossValidated Community,
I must mention that I am a first-time poster (and relatively new to both modelling and R), so please excuse any norms I may violate in my post and politely inform me.
I ...
3
votes
0answers
367 views
How do I estimate a repeated measures ANCOVA in R and SPSS?
I'm currently running a perception experiment:
DV: error (this in degrees- how much an observer was away from the real answer)
IV: the time bin (5 levels) in which the unique stimulus appeared
...
1
vote
1answer
245 views
Interactions with R? ANCOVA in R? I want to see if certain variables affect a dependent variable in R using repeated-measures
I have done an experiment in which the same people have been measured in two conditions, the same room with and without plants. I know they performed significantly better on a reverse digit span task ...
5
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0answers
373 views
How to compute confidence interval in ANOVA with repeated measures?
I made a model using repeated measures univariate ANOVA in R.
...
4
votes
2answers
244 views
Is repeated measures ANOVA a correct method for my data?
My experiment is a completely randomized block design. The objective is to find whether a variable is different between species $a$, $b$, $c$. The measurement was taken 2 times (June, July) in each ...
6
votes
1answer
564 views
