Tagged Questions
0
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0answers
12 views
Not all subjects undergo conjunction of two treatments, two-way within-subject (repeated-measures) ANOVA correct?
I am wondering about the correct statistical analysis for an experiment involving 2 independent variables (treatment A, 4 levels and treatment B, 2 levels) and one dependent variable (C, score). ...
2
votes
1answer
35 views
Repeated Measures ANOVA with several measures entered together: how to find main effect
I've run a 2 (treatment and no treatment) x 2 testing occasions (pre and post) Repeated Measures ANOVA. In addition, I entered several tests given at both time points, so under the Repeated Measures ...
1
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0answers
41 views
Non-parametric test for comparing four treatments and three times
I am working with a dataset where I need to use non-parametric stats (won't go into details). It is behavioral data on captive animals ($n=8$), where $4$ treatments were introduced $3$ different times ...
1
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1answer
41 views
Interpreting multivariate tests in repeated measures
I have a within subjects design with 4 DVs and I ran a repeated measures analysis on SPSS. My DV is a physiological measurement and is not expected to be linear.
My multivariate Wilks lambda is ...
0
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0answers
39 views
Is repeated measures ANOVA the right test?
I am studying a parameter in several organs of mice and I have two categorial factors. I would like to study the effects of those two factors on my parameter in each organ (I don't care about ...
1
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1answer
85 views
Replicate ANOVA with linear mixed model in SPSS
I am trying to replicate a mixed ANOVA using a mixed model, but the mixed model is giving me different results. I'd like to know why, and how to get them to give the same results, assuming this is ...
1
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0answers
36 views
How to write the error term in repeated measures ANOVA in R
My question is very closely related to a previous post
Error term in repeated measures ANOVA in R
However, I would like to get more insight into how to define the error term.
Suppose I have a ...
0
votes
0answers
45 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 ...
2
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0answers
37 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 ...
2
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1answer
72 views
R: Greenhouse-Geisser in Anova from car package
i have a question concerning the output from {car} Anova. I want to run a simple 2x2 repeated measures ANOVA using the multivariate approach. I can run the (modified) example from the Anova {car} help ...
3
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2answers
136 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 ...
1
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1answer
63 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
votes
1answer
50 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 ...
1
vote
2answers
59 views
Experiment with two groups, pre- and post- treatment assessments
I am conducting an experiment with a control group and a treatment group. Both groups will take a pre and post treatment depression inventory. What statistical procedure do I use to determine if the ...
2
votes
1answer
57 views
Blocked repeated measures ANOVA in R
I am trying to test if richness varies by treatment (Severity) over time (Block) using a repeated measures ANOVA in R. Any suggestions on how to do this correctly? I have tried, but get an error ...
2
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0answers
54 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 ...
1
vote
1answer
35 views
Appropriate Analysis for ordinal variable, repeated 4 times under different conditions, by the same 2 raters
I am doubting myself on which analysis to run for the following:
18 participants were evaluated at 4 time points with different conditions at each time.
They were given scores (on a discrete visual ...
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2answers
75 views
2
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0answers
42 views
Two uneven groups (101 vs 21) measured twice; what repeated measures ANOVA equivalent can help?
I have a question that I have difficulties in answering:
I have two groups of patients tested twice at the same continuous variable.
Group A=104 & GroupB=21.
So two groups, one continuous ...
0
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0answers
34 views
2 x 3 Intervention Study Design
I have an intervention that I want to test and I am a little bit "statistically challenged." There will be two groups (treatment and control) over three periods of time (pre-test, post-test, and a ...
0
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1answer
108 views
repeated measures factorial design
I have learned about repeated measures ANOVA but is it possible to have a repeated measures factorial design? So if you have factor A with 2 levels and factor B with 2 levels where each combination ...
1
vote
1answer
133 views
Repeated Measures ANOVA missing values - run separate models?
I am evaluating pre and post test data for 2 groups using repeated measures ANOVA. Given that I am missing a few data cells, the final n is reduced in the analysis. I'd like to know if I can run ...
1
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0answers
10 views
Is dependence of one classification on another a violation of the assumption of independence for ANOVA?
My subjects are mice, swimming in a pool for 60 s. The DV is how much time they spend in each quadrant of the pool. The performance of each subject is independent of every other subject. However, ...
1
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0answers
125 views
Repeated measures ANOVA: Mauchly's test undefined
I'm doing a two-way between-within ANOVA in SPSS. I have two groups with 9 subjects each (so total = 18), and 24 levels of one repeated measure.
I understand why Mauchly's test of Sphericity has no ...
1
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0answers
33 views
Help in validating my experiment design
I've devised an experiment plan for an experiment in the domain of cognitive science, but I'm not 100% sure, if my idea about statistical analysis is correct.
I'm performing this experiment for my ...
0
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2answers
181 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 ...
0
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0answers
111 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 ...
1
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1answer
95 views
Pre-Post analysis with repeated measure
I've 50 subjects and ran an experiement 4 times for each subject and collected the pre and post vlaues for each run. I need to do pre post analysis. Here a sample of my data:
...
0
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0answers
286 views
Calculating Tukey HSD following a repeated measures ANOVA
I was wondering how to calculate Tukey's HSD to follow up a three-way repeated measures ANOVA by hand. I tried to infer how to do it by modifying what I would do in a between subject ANOVA, but I'm ...
3
votes
0answers
138 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
vote
2answers
37 views
Are these participants repeatedly measured?
I have Likert items for a number of students learning Spanish and English at the same time. I really need to compare the means for each (non-normal) variable to see which language is voted higher for ...
0
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0answers
224 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
...
0
votes
1answer
119 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, ...
4
votes
1answer
441 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:
...
0
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0answers
402 views
How do you interpret the test of between subject effect in mixed ANOVA?
I am doing research on perception and writing styles.
I subjected my participants to 2 type of writing styles and a pre test and post test to measure their perception. I have done a repeated ...
3
votes
2answers
328 views
Effect size in contrast analysis
I'm running 2-way repeated measures ANOVA (3 and 5 levels) with planned contrasts afterwards. I'm interested in comparing
1)levels of the first factor among themselves (e.g. A1B with A2B, A2B with ...
0
votes
1answer
140 views
Independent and dependent variables in Repeated Measures ANOVA
I am working on a study where I have a sample of 86 students. I have tests for 5th grade, 6th grade, 7th grade, and 8th grade. I think I can run a Repeated Measures ANOVA since I have observations for ...
1
vote
1answer
127 views
Combining between and within-subjects designs?
I have a two by two design. Ideally I would run the whole thing within-subjects (all participants get all conditions) but the procedure is too long. I could run one factor between-subjects (each ...
3
votes
1answer
257 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:
...
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0answers
127 views
1
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0answers
65 views
Comparing performance between individuals across time with variable number of measurements
I have data for multiple people, where each person performs and is graded on a task an arbitrary number of times each year across multiple years. E.g. -
...
1
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0answers
501 views
How to assign degrees of freedom for two-way ANOVA with two within-subjects factors?
I have an experiment with 44 subjects and two within-subject factors, condition (3 levels) and round (6 levels). It is fully crossed such that each person completes one of each task condition in each ...
3
votes
2answers
251 views
How to deal with repeated measurements in the same condition of a factorial experiment?
I am in Psychology and trying to explore the utility of mixed modeling for analyzing my repeated-measures data in a factorial experiment. The primary reason for using mixed models is that I would like ...
7
votes
1answer
735 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 ...
0
votes
1answer
184 views
Two-way repeated measures ANOVA for categorial data?
I would like to ask you whether I can run two-way repeated measures ANOVA (GLM) to see the effect of scoring method on pass rate when my variables are categorical, and whether I define well my ...
1
vote
0answers
46 views
How to describe a study design looking at one sample of which different data was collected during several periods of time
I am conducting a research on the effect of burnout on anxiety, tiredness and sleep, before a particular event and after an event.
There is one sample of which different data was collected over 6 ...
0
votes
1answer
140 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 ...
1
vote
1answer
388 views
One-way repeated measures ANOVA with G*Power
I have made an experiment with 28 subjects. All made the experiments under 3 different conditions (A, B and C). So I have a table like this:
...
2
votes
2answers
507 views
Anova repeated measures is significant, but all the multiple comparisons with Bonferroni correction are not?
I counducted a mixed model ANOVA with time as the within subjects variable (3 levels) and group as the between subjects variable (2 levels).
All is significant (time, group, and timeXgroup).
To test ...
2
votes
2answers
231 views
How to do repeated measures ANOVA for two groups in SPSS and 12 time points?
I am measuring one parameter (say weight) repeatedly at different time points (say monthly, for 1 year) for two groups (say experimental and control groups). My data looks something like data posted ...
