Repeated measures data occurs when more than one measurement is collected on the same unit (e.g. subject). This data cannot be analysed through normal methods because the rows in the data are not independent due to the multiple measurements. The time sequencing of the measures may not be important.

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What deviation to choose in the error of the mean? [on hold]

What is the error of the mean of several measurements, if each measurement has some error? When one does $N$ repeated measurements of a particular variable $x$, the resulting set of measurements ...
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12 views

Repeat measures regress

I have a question about using regression for repeat measures analysis. I have a design in which each participant viewed 4 sets of pictures. 2 sets were positive and 2 were negative. There were 2 ...
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18 views

Generalized additive mixed model in R - specifying a fit function

The data in question comprise two response groups (no response vs. stress signal), different individuals, repeated measures ...
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19 views

Repeated measures or two-way ANOVA, and power analysis

A sample of patients will undergo two treatments. Every patient will receive both treatments.One treatment will on the left side and the other different treatment on the right side. Repeated ...
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2answers
32 views

What test to compare three groups with data before and after an intervention?

I am writing a proposal for a study. I have 3 groups: Group A- receiving specialized intervention technique Group B- receiving regular intervention Group C- control/receiving no intervention I ...
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15 views

Interpreting a repeated-measures two-way ANOVA in R

I'm not sure if I've structured the model correctly, and if I have, I'm struggling to interpret the output I get anyway. I had 40 respondents exposed to 4 groups of stimuli - let's call the groups a, ...
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11 views

Generalized Estimating Equations- How many predictor variables are too many based on sample size?

I am conducting analyses on wild animals, on how diet of an individual changes based on environmental changes. I will list the setup of my dataset below. Until now, I have been running independent ...
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20 views

How to compare repeated measurements among groups with non-normal data?

I want to investigate differences in two variables among 3 groups. The variables are "% of time active" and "latency to exit a cage", and each group corresponds to a different context (the focal ...
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14 views

A binomial test with repeated measures?

I'm working on a study with a single trained animal (ie. our only participant). He is making a binary choice on a number of consecutive trials (we are essentially trying to teach him a rule -- if A, ...
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6 views

What type of within-subjects design should I use? Error-rates, Distances

I know I need to use a within-subjects design for this, but I can't figure out what type of design to use. I am an amateur at statistics and haven't taken a statistics course in years. I will try to ...
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34 views

Single group with repeated measures using R? - Trend analysis (linear, quadratic effect)

I wonder how to get the repeated measures analysis of variance using R. My data is like this. ...
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21 views

Repeated measures interaction with categorical and continuous predictors

I'm trying to do a repeated-measures analysis to determine the interactive effect of 2 continuous predictors (itss_c and ladder_c) on an outcome measure that was assessed at 3 points in time, but I'm ...
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17 views

blocked split-plot design with repeated measures

I have an experiment measuring ecosystem carbon uptake over multiple years with 4 different treatments replicated in 3 blocks across the landscape with a split-plot design. I want to know whether ...
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1answer
32 views

Linear mixed effect model with repeated measures using lmer

Background I think I am close to the error structure I want for random effects but not sure about some parts of it. I am carrying an experiment on wheat plots in a field to measure the increase in ...
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16 views

3-way repeated mesures ANOVA

I conducted reaction-time experiment with three factors - set size (4, 16, 64), presense of the target (present, absent) and the third factor with two levels (C, F). After that I ran a repeated ...
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19 views

What analysis should I run?

For an RCT, I want to test scores on BES(Binge Eating Scale) and BMI over time for two different groups(experimental and control group)to register whether treatment had an effect on reducing symptoms ...
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7 views

Testing for a 3-way interaction between a within-subjects factor, a continuous IV and a categorical IV in SPSS

I'd like to test whether the moderating effect of a (continuous) personality variable on the effect of an experimental manipulation differs between conditions. Does anyone know how to go about this in ...
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1answer
14 views

Repeated Measures - repeat measures at same site but at different distances

I have a study where I have two stress zones (high and low stress). In each zone, I have 10 sites. Within each site, I am setting up traps at 1m, 2m, 3m, 4m, and 5m away from a focal plant. My ...
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27 views

SPSS: descriptives in repeated measures

This is a question that has been bothering me for a long time, and until now I haven't been able to come up with a decent solution. Imagine you do a straightforward repeated measures analysis in SPSS ...
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25 views

Which statistical test should I use?

For the following data set, which statistical data should I use to analyze this data? For different birds, different types of songs were played, and response scores were recorded from pre-playback, ...
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26 views

Split-split plot design (with replicates) with repeated measures

I'm looking for references that can guide me with regard to the analysis of a split-split plot design (with replicates) that also has repeated measures over time. Ultimately, I need to be able to: ...
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12 views

Two ways to model pre/post/treatment setting. Which one is preferred and why?

I have 20 individuals randomly distributed into two groups(treatment vs non-treatment) and test_score was measured before/after the treatment. My central goal is to measure the effect of the ...
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8 views

Comparing Learning Rates using Unit Curve in R

I have data for an experiment where 2 groups (Role) were tested over 3 consecutive trials for a task and time to complete task was recorded in sec. I wanted to compare the learning curves of the two ...
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17 views

Pooled likelihood in R, how to code it? [migrated]

I don't really know how to construct the following likelihood in R. I have panel data for several individuals. Each individual is observed over time and I have several observations for each ...
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1answer
54 views

How to calculate confidence interval of a data?

How to calculate 95% CI data for the following 11 readings: 102.61 100.31 107.04 95.00 105.61 97.75 107.76 96.56 92.90 96.98 102.03 Average = 100.41, Std. dev. ...
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1answer
41 views

Would multiple t-tests be appropriate

I have reaction time data from four different age groups, and I am hoping to prove that reaction time improves with age. I know that ANOVA would be preferred to determine if age has an effect, but I ...
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1answer
42 views

Which stats tests to use? Bee flight activity quantified during an eclipse

I'm trying to perform a statistical analysis but not sure what test is most appropriate. The experiment and snippet of sample data are below: Methods: Bee flights from a beehive were recorded, ...
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29 views

Repeated measures with time varying covariates in R

On this page (Model 5, http://www.ats.ucla.edu/stat/spss/faq/repeat_covar.htm), there is a description of how to carry out this type of analysis using SPSS. Does anyone know how to do the same thing ...
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28 views

Observed vs expected values for a dataset with repeated measures

I am hoping you all may be able to help me select the appropriate statistical analysis for a subset of my data. I have a population of monkeys that consists of 50 individuals in 3 groups. ...
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21 views

repeated measures ranking data

I have a repeated measures design where 180 participants rank their preferences for 12 items at time1, and then undergo an intervention, and then they rank their preferences for the same 12 items ...
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1answer
52 views

How to use a linear model with two factors and repeated measures?

Suppose I have a date set of the form: ...
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12 views

dependent and independent categorical variable across eight trials

Study: significantly selected color for a particular letter. My sample size is 30 and the study is within subject. Independent variable -> letters (total 8)... Dependent variable -> colors ( total ...
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28 views

Repeated measures linear mixed effects model

I am working with trees that were fertilized in a full factorial design (N x P x K) in plots that are replicated four times. I currently have a mixed effects model with this structure: ...
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1answer
52 views

SPSS - Calculation of confidence intervals in estimated marginal means of repeated measures ANOVA

I used SPSS to do a repeated measures ANOVA including one within- and one between subject factor. Let's say the between-subject factor is treatment group with levels treatment and control, and the ...
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1answer
34 views

Difference between two measures

A numerical value was generated for each of 65 samples on machine A at time T, and then on machine B and time S. I tested for a difference between the two runs using R as follows: ...
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47 views

GEE as alternative for Linear Mixed Models

A linear mixed model requires the residuals to be normal. In the case of a simple linear mixed model with a random intercept only, a colleague of mine was arguiing that I could just use a GEE with an ...
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23 views

How to account for both between-subjects and within-subjects covariables?

I have a data set I'm trying to analyze and I can't figure out how to include the two different kinds of covariables in my analysis. Without the covariables, the analysis isn't too complicated. It's ...
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14 views

Specifying interaction contrasts for within x between terms in SPSS

I am trying to analyse a dataset with 3 groups of subjects and one repeated measure with 6 levels (accuracy at identifying 6 different emotions). I am using the GLM command from SPSS to do this, which ...
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22 views

Logistic regression with multiple outcomes

I have a study looking at the association between a novel diagnostic measure (continuous var) and a health outcome (measured at 4 different time periods; binary). In addition, data on traditional ...
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11 views

Repeated measures in GLMM

I have a dataset in which individuals in some plant populations were measured over 3 consecutive years. My response variable is the reproduction of each individual. My fixed effects involve: one ...
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0answers
16 views

How to specify repeated-measures model most adequately and correct for multiple comparisons

I am struggling with 1) the correct specification of my model and 2) the question on how to correct for multiple comparisons. The details: I have a data set from 13 subjects, measured on two ...
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1answer
28 views

Compare means of two (contentwise) different variables

I have a question about comparing the means of two variables that have a different meaning but a (possibly) similar ways of measuring them. To give an example: Let's say I am conducting a study in ...
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1answer
61 views

Should the within-subject variability decrease?

I have a crossover experiment design, detailed as follows. there are 7 sites conducting the same experiment; In the experiment of each sites, 5 different treatments are administered to $n_i, \, (i = ...
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29 views

Adding in L2 predictor in GLiMM fails even though ICC is high

I'm using SPSS GLiMM to run a repeated measures logistic regression model. Research Qn I'm interested to know if a MP is more likely to make a particular response (e.g., apology, challenge, denial) ...
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1answer
21 views

Help need identifying analyses methods

Any and all help would be much appreciated! I've detailed a bit of information below, but if I left anything out please let me know My hypotheses are (info: NA= novel asssembly; S= selections or ...
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19 views

MANOVA on long data format

I need to run repeated measures MANOVA on long data format (the format was created to derive a categorical variable that is needed to be used as IV). Running RM MANOVA on long data format using a ...
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1answer
204 views

R: equivalence between an aov between-within repeated measures model and an lmer mixed model

I have some trouble obtaining equivalent results between an aov between-within repeated measures model and an lmer mixed model. ...
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46 views

Estimating and comparing pre-post treatment effects in multiple pairs of treatment-vs-control groups

I have a dataset from an experiment where the goal was to study in which plant ecotype a treatment with a certain bacteria had the greatest effect. Hence the data consists of a number of control and ...
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25 views

How to analyse binary outcome data with between- and within subjects factors?

I am looking for the right statistical procedure to analyse my data (mixed design) with binary outcomes. Between-subjects variable: treatment (yes or no); experimentally manipulated Within-subjects ...
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17 views

F-Test in ANOVA with two within-Factors: why are there different denominators in the F-test?

in a two factorial ANOVA, the MS of Factor A (or B) as well as the interaction is divided by the MS of the residuals: e.g. F = MS_FactorA/MS_Residuals If I have two within factors, only the ...