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 does the number of measurements refer to for a repeated measure MANOVA or MANCOVA?

I am using GPower to calculate the required sample size for a MANCOVA test. GPower doesn't list MANCOVA as an option in the F-Test family. Repeated measures MANOVA, within-between measures is listed ...
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13 views

Interpreting conflicting results of repeated-measures ANOVA using different functions in R

I have run a repeated-measures ANOVA using the aov() function, Anova() function and lme() ...
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9 views

Repeated measures ANOVA with custom standard errors

I want to see if there's a difference in size of some cells after several measurements, compared to a baseline (0.5, 1, 3, 6 hours versus 0 hours). I have 3 samples. Each measurement is actually a ...
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2answers
49 views

How can I model a binary outcomes in time series using logistic regression?

My data has a binary outcome (attack or not attack), day (20 day in repeated measured design) and some covariates (nestling’s movement). The objectives of my experiment are testing the effect of time ...
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3answers
43 views

What statistical test should I use to look at change in a binary outcome over time?

I am designing a study that will look at medication adherence for HIV+ mothers at 6 weeks and 6 months postpartum. The adherence measurement is binary (1= adherent, 0= not adherent) so I will end up ...
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41 views

Is there a way to do a statistical test if an independent variable has only 1 level?

I have a repeated measures design in which I tested multiple individuals with three different sounds (playbacks). The playbacks were 20 seconds in length and I recorded 1) how individuals responded ...
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27 views

Mandatory participation vs. random assignment

Can I make a statistical inference about the effect of a training intervention on a population of employees if participants are not randomly assigned to participate in the training but required to ...
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9 views

extracting t value out of pairwise.t.test [migrated]

I would like to know if I could extract t values out of the pairwise.t.test function since it is only reporting the p values. I used the pairwise.t.test() for multiple comparisons after running a ...
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7 views

Type of Analyses for Pre and Post Test Study

I have three dependent variables, all continuous that I am measuring before and after a treatment intervention. I am planning to do a MANOVA but get confused with how to input variables and factor ...
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5 views

How to test correlation of two variables from four repeated measures of each one among four groups

I have four plots from where I took a measure of two indicators of population abundance (as continuous variables) throughout four surveys (say, at spring 2010, fall 2010, spring 2011, fall 2011). So, ...
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1answer
29 views

How to use ANOVA with two or more data points per condition per participant?

I'm preparing my first ever experiment for my PhD and am currently facing some difficulties with statistics. Here is my draft experimental design: 3 factors with 5, 3, 3 levels. As a result I have ...
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12 views

Mixed within-between ANOVA or MANOVA? [duplicate]

I am doing a research, the instrument of which is an English proficiency test that consists of two parts: one part is related to the test-takers' field of study and one part is unrelated. my ...
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11 views

Non-Parametric ANOVA: Repeated Measures with Replication

I'm struggling to find out which ANOVA test to use when you have a non-normal data set with repeated measures AND replication. I'm doing my data analysis in R and the friedman.test() method says it ...
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23 views

Using G*Power to determine the sample size for an repeated measures ANOVA

I am currently designing an experiment that I want to analyze using an RM ANOVA. Since some of the factors are confounded I need to do multiple ANOVAS. One analysis will be for 2x2 factors (within ...
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17 views

How to analyse the ratio of two continuous variables sampled repeatedly over time

I am measuring reproductive hormones in dolphins over time to look at seasonal changes. The sample type (respiratory vapour) that I am using suffers from variable water dilution that cannot easily be ...
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1answer
176 views

Is using error bars for means in a within-subjects study wrong?

I seem to recall one of my professors saying that error bars are completely uninformative when comparing repeated measures taken from a single group. Is that true? Surely many studies compute the ...
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1answer
61 views

modelling time as continuous vs. discrete

I am writing an analysis plan for data that is collected on approximately 30 people at approximately 5 unevenly spaced time points. I am planning to analyze the data via a repeated measures mixed ...
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1answer
45 views

How to test whether people remembered more items given an intervention administered within subjects?

I have 20 individuals who memorised 5 lists of information. They immediately recalled the information, then at the end of the day either received an interventional 'cue' or nothing prior to recalling ...
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24 views

Interaction between continuous predictor and repeated-measures factor in R

How can I test for the presence of an interaction between a categorical repeated-measures factor and a continuous predictor? I'm using R. My data looks like this: ...
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1answer
15 views

Continuous predictor of a significant difference on another scale at T1 and T2

I was wondering if anybody could point me in the right direction for a statistical test. I’m looking whether a continous variable (e.g. a personality variable) predicts a significant difference ...
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12 views

How to implement cross-classified(multiple group membership) repeated measure analysis?

Happy new year! I have a longitudinal dataset with 4 time points (2 measured in fall and spring semester of prek year, and 2 in fall and spring semester of k year). As a result, a same student has 2 ...
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1answer
31 views

When or why do i utilize the repeated measure design in my analysis?

I know the Repeated measures ANOVA is the equivalent of the one-way ANOVA, but for related, not independent groups but I can't understand. When can I use this design? When one way? And when repeated ...
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1answer
45 views

Account for multiple treatments to the same subject when the treatments are a numerical variable

254 individuals were asked their purchase intent of a product (on a 1-5 scaled) at different prices \$699, \$799, \$899, \$999, and \$1099. The data looks like: ...
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15 views

Pretest-post test and General Linear Models

I have two continuous variables; a pretest and a post test results. They seem to have significance in paired samples; p=.000. However I wonder what caused the post test to be better than the pre test ...
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51 views

How to demonstrate that the number of errors decrease as the number of datasets a value is present increases

I have 16 datasets of differing sizes. I am looking to see if independent values (which may be in one of two states) are present within each dataset and if it is present to see if it is in the same ...
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21 views

Which stats model to predict rank when participants arrange conditions by rank?

Just a quick clarification: This question is about when participants specify which condition is most X, second most X, third most X, etc. It's not about the researcher converting continuous DV's into ...
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Comparing differences between overlapping groups

I am trying to analyse the differences between people who vote in the European Parliament (EP) elections and people who vote in national elections, based on the EES dataset (http://eeshomepage.net/). ...
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31 views

ANOVA of pairwise (non-independent) data in R

I am trying to do a one-way ANOVA of data that is generated from pairwise comparisons, and am having difficulty resolving the problem of non-independence. I have 12 populations, and for each pairwise ...
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25 views

Normality violation in Two-way repeated measure ANOVA

I have a sample of around 25 in my within-subjects design, and two factors (music, and flanker type), each with three levels. My DV is reaction time (measured in milliseconds). This gives me 9 ...
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1answer
46 views

Multiple paired T-tests after two-way repeated measure ANOVA?

I conducted an experiment to investigate the effects of musical complexity on visual attention and am now analyzing my data. I ran a two-way repeated measure ANOVA, with my two factors being Musical ...
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3 views

Does a within groups design necessarily mean the data is matched?

I am seeing conflicting information on this. The design is within groups with 4 groups. Each user experiences all four groups in a random order. There is no real reason the results of one group would ...
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17 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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27 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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39 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
39 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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18 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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17 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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22 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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23 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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51 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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25 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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31 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
49 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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19 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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22 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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11 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
19 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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29 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, ...