Tagged Questions

2
votes
1answer
36 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
vote
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 ...
1
vote
0answers
26 views

How to test for significant difference between 2 binary variables in one sample [duplicate]

I would like to test if there is a significant difference between the pre-test and post-test in a dichotomous variable (0 = "False", 1 = "True"). I'm using only one sample of 30 subjects. So, my 2 ...
1
vote
1answer
86 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
vote
1answer
133 views

How do I set up a single continuous independent variable for a repeated measures linear model?

I'm doing an education study and I'm trying to see the effect of website usage on quiz scores in a class of college students. There were 30 students in the class and they took 10 weekly quizzes over ...
1
vote
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 ...
3
votes
1answer
269 views

Box's test for equal covariances or Mauchly's test of sphericity?

I am writing a report on a 2 x 3 mixed study. There is ONE within IV with TWO levels and there is ONE between subjects IV THREE levels. There are two DVs. Sample sizes for each group is 25, 25, 27. ...
0
votes
0answers
74 views

Test of normality repeated measure ANOVA

I'm trying to do a repeated measure ANOVA analysis on the 5 NEO-FFI factors (Neuroticism, Extraversion, Openness to experience, Agreeableness and Conscientiousness). Sujest are tested only once, so I ...
1
vote
1answer
171 views

To find significant differences between means using repeated measures GLM

I am new in using SPSS and stuck with General Linear Model [which is just linear model] procedure. I have 8 cognition variables like latency, thigmotaxis, spatial, quadrant, nt quadrant, proximity, ...
1
vote
0answers
148 views

Mixed model repeated measures, nested

I have a study in which I have 3 groups of crews (4 crews in each group) in which there are two people (L/R). Each crew experienced 4 lighting treatments (D1-4), once in one position, and again in ...
1
vote
1answer
258 views

Comparing groups at different time points within repeated measures study using SPSS

I have done a RCT (randomized control trial) of an intervention (which is of 6 week duration) versus control. The outcome measure (an exercise test) has been tested pre-intervention (Pre), immediately ...
0
votes
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 ...
0
votes
0answers
652 views

Pre-test, post-test multiple comparisons

This feels like it should be a very straightforward stats analysis but I'm struggling to find a solution. I have a data set made up of pre- and post-test continuous data values taken from multiple ...
2
votes
0answers
64 views

mixed ancova or difference scores?

I am puzzled with how I should analyze the following data: The dependent variable is respiratory sinus arrhythmia, a measure of parasympathetic activity (RSA). I have a $5\times5$ full factorial ...
2
votes
1answer
439 views

Multiple Paired samples T-tests?

I'm trying to determine the effect of taking a training course on various aspects of being a good quality worker. I have pretest and post test data on 7 different ways job performance can be viewed. ...
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 ...
2
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0answers
55 views

ANOVA variable that is both BETWEEN & WITHIN

Does anyone know how / if can you treat an independent variable as BOTH a between AND within subjects variable (ideally in SPSS ANOVA-repeated measures). That is, we have a repeated measures study ...
1
vote
1answer
179 views

How to model repeated measures with time-varying covariates in SPSS?

I wanted to test the effectiveness of a particular type of "talking" therapy on depression. I envisaged selecting ONE group of people and measuring their heart rate and scores on depression scale for ...
1
vote
0answers
256 views

Mixed linear model with repeated measures in SPSS

I'm trying to run a mixed linear model analysis with SPSS. When I try to run the analysis, SPSS gives the following error message: ...
0
votes
1answer
140 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 ...
3
votes
0answers
377 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 ...
2
votes
1answer
843 views

How to interpret an interaction effect in SPSS output for a repeated measures anova with between and within group factors?

I have conducted a repeated measures ANOVA, with 2 factors: One between factor (Ex_control: exercise intervention versus control) One within factor (...
2
votes
1answer
489 views

How to do a repeated measures analysis with binary DVs and a single binary IV?

I ran an experiment where participants were randomly allocated to 2 conditions. They then completed 3 seperate tests with a binary pass/fail outcome for each test. So I have 3 binary (within-subject) ...
0
votes
0answers
200 views

What is the “Main effect” in General linear model with repeated measures

For my bachelor thesis I used an General linear model in SPSS with repeated measures. The data is from a research project on emergent literacy I did with an eye-tracker. The 3 within subject factors ...
3
votes
1answer
320 views

How to carry out repeated time-to-event analysis in SPSS?

Please note that I also posted this same question in an SPSS specific forum, however if anyone here can also help, I would appreciate it. I have a question regarding repeating time-to-events ...
5
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0answers
89 views

Balanced repeated measures design

Okay this is my problem: I have 12 participants. Each participant spent 3 nights in my lab doing a reaction time task at four timepoints during the night(12, 1, 2 and 3 oclock), with one week ...
2
votes
0answers
267 views

Controlling for a variable in a GEE using SPSS

I have a dataset which I think would suit GEE. I am trying to assess the relative contribution of a number of simultaneous predictors and their interactions to the intensity of hurt feelings. I asked ...
0
votes
0answers
87 views

What model should I use for comparing two techniques in SPSS?

I have 20 images taken from 20 subjects, two methods for analyzing these images, one as a reference, I want to see whether there is a statistically significant difference between the new method and ...
2
votes
1answer
998 views

How to analyse multiple between subjects factors in a mixed ANOVA in SPSS?

I am performing a Mixed between subjects Anova where I have multiple time points that subjects have completed a measure at. The within subjects factor is time. The between subjects factors include ...
0
votes
0answers
225 views

Covariance matrix in multilevel repeated measures model

I'm trying to fit a multilevel model for a repeated mesures design with three levels: Sujects - conditions - trials. Each subject pass the test in two conditions, and there are 21 trials in each ...
2
votes
1answer
146 views

How do I predict subject mean (w/ error) with repeated measurements in SPSS?

Context: say I am trying to determine the concentration of a chemical, so I take known concentrations of the chemical and make a standard curve (6 measurements per standard) then measure my unknown 6 ...
1
vote
0answers
210 views

non-collapsed data - repeated measures mixed ANOVA

I have to analyze results from an experiment and I’m not sure about how could I do it… The experiment is about the effect of some particularly distorted image typology on response time. The design is ...
2
votes
2answers
2k views

Repeated measures ANOVA or Friedman test?

I have a study with 35 subjects who received hypercoagulability testing at 4 different times (before surgery, after, at 1 week, and at 1 month). Each subject has 9 different test of hyper ...
0
votes
1answer
322 views

How to do a repeated measures ANOVA with missing combinations in spss

I currently have a setup, for which I want do do an ANOVA in spss. In my model I need to include four factors (I'll call them factor1 to ...
-1
votes
1answer
449 views

Where are the t-values in my pairwise comparisons?

I have data from a study with three conditions. The independant variable was within-subjects and within-items. I did an F1 and F2 analysis (= twice a repeated measures anova) on the averages, by ...
1
vote
1answer
3k views

Estimated Marginal Means or means from descriptives?

I'm currently looking at a 2x2 Repeated Measure Anova for an undergrad project but I'm struggling to find information about which means to report. I will be reporting the Within-Subjects Anova,the ...
4
votes
2answers
1k views

How to correctly treat multiple data points per each subject

I am currently arguing with someoe on how to correctly treat data with multiple measurements for each subject. In this case data was gathered for each subject within a short time for different ...
2
votes
0answers
112 views

How to do post-hoc contrasts on within factor depending on certain between groups in SPSS?

Here are my experimental factors: within-factor (two levels): time1, time2. between factor (four levels): 4 groups. I want to test specific post-hoc contrasts comparing: group1: time1 vs. time2 ...
2
votes
1answer
134 views

Why might the means estimated by GLM ANOVA differ from those calculated by hand?

I'm currently analysing some EEG data using a repeated measures general linear model, and I've run into a problem. I have three within-subject factors; Scalp area (3), condition (2) and word (2). When ...
3
votes
2answers
519 views

Different F-ratios for within subjects effects when using SPSS and R's aov

I've just compared the ANOVA tables generated by SPSS and Statistica with the aov table provided by summary(aov.model). They yield identical between Subject effects (e.g., NativeLanguage(English vs ...
7
votes
2answers
5k views

Understanding repeated measure ANOVA assumptions for correct interpretation of SPSS output

I am investigating whether different reward conditions may affect task performance. I have data from a small study with two groups, each with n=20. I collected data on a task that involved performance ...
0
votes
1answer
803 views

How to carry out repeated measures ANOVA?

I have the following data: IV = 2 levels (Experimental Group + Control Group). DV = I'm using signal detection variables i.e. (Hits, CRs, FAs & Misses) Both groups were tested twice so ...
3
votes
2answers
523 views

Is SPSS giving the wrong residuals for a repeated measures design?

When running a repeated measures ANOVA in SPSS, it's possible to 'Save' the residuals as new variables in the data editor. But the values output do not match the residuals given in R, and seem to be ...
1
vote
0answers
1k views

How do I run a Mixed Model repeated measures analysis in SPSS to evaluate intervention effect while controlling for school?

I am trying to evaluate the effect of an intervention. I have a group-randomised rct design and have established that I have a design effect and therefore need to control for school. So far I have ...
1
vote
2answers
3k views

How to set up a two-way mixed ANOVA with a covariate in SPSS?

I wanted to carry out a two-way ANCOVA for my data. However, SPSS isn't liking that I have only one IV. I have One IV: Group (3 levels, i.e. 2 experimental groups and a control group), One DV: ...