0
votes
1answer
28 views

Mixed model in SPSS with random effect and repeated measures

I am working on analyzing a dataset that involves repeated measures data. The data was previously analyzed by a colleague using custom code written in C++, but I have expanded the dataset and am ...
0
votes
0answers
6 views

Estimation of change and difference in changes for repeated measurements

In an ongoing project concerning life style changes, I can't find the way to study the difference in effects over time between the intervention and the control group. The project is set up as a an ...
0
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0answers
6 views

Repeated measurement model for Dichotomous variable in spss?

I have a repeated data in 7 diffrent time and 4 group. my variable is Dichotomous (yes/no). How I can do it with spss? what non-parametric test could I use? I appreciate your answers Leili
1
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0answers
12 views

some suggestions for analyzing two-factor within subject design?

I'm doing a two-factor within-subject design experiment, and the two factors are all categorical variables. factor one has four categories, while factor two has two categories, and is counterbalanced. ...
1
vote
0answers
32 views

How to do multiple regression with within-subject independent variables using SPSS?

I have two groups of subjects, both undergoing two experimental conditions. During the experimental conditions, the subjects take questionnaires for evaluation of the mood states, and blood pressure ...
0
votes
0answers
11 views

How to do and interpret a generalized estimating equation

My study is looking at the effects of enclosure type (1 IV (penned v not penned)) on the stereotypical behaviours and interactions (2 DV's (counts)) of elephants, however using rain (yes/no) and high ...
0
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0answers
22 views

SPSS Repeated measures with different pre-post measures

I have the following data: 20 participants, each one going through 2 types of treatments (A & B) at 3 different sessions (times). For each treatment session, i am collecting 6 "normal" ...
1
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0answers
38 views

Understanding repeated covariance types in SPSS?

I am working in SPSS on a repeated measures linear mixed model and I am having a really hard time wrapping my head around how to select a "repeated covariance type". The options are: ...
1
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0answers
58 views

How to: repeated measures anova and Friedman's test with multiple imputations for missing data

I have a study where patients were measured pre-operatively (time_pre), post-operatively (time_post) and long-term follow-up (time_lt). I have 60 subjects. Data consists of: 5 scale variables ...
1
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0answers
30 views

Repeated measures ANOVA with missing data

I have a DB with multiple missing values (scale, ordinal and nominal). I used multiple imputation to fill in these missing values. How can I perform a repeated measures ANOVA on these (5) datasets? ...
1
vote
1answer
44 views

How to compare means of repeated measures between groups in SPSS

I'm having trouble regarding which test to run on my data in SPSS. I have two groups (condition1 and condition2) which is also my independent variable (categorical). Both groups were asked to rate ...
1
vote
0answers
47 views

Repeated Measures ANOVA pairing counterbalance issue

I have been conducting all of my analyses on one DV (Quality) using a repeated measures ANOVA, with two variable (Time and Gender) at two levels each. However, it occurred to me today, that this might ...
0
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0answers
22 views

Two Groups Time 1 and Time 2 Nonparametric

I want to look a the effect of an intervention on work satisfaction and motivation. The data not normally distributed. I have two groups, intervention and control, with 11 in each group. I measure ...
0
votes
0answers
44 views

Repeated Measures ANOVA or mixed model? And with massive group differences?

I need some guidance on which statistical test to use: I want to know if the nature of frog calls changes depending on the time of day. I observed 4 species of frogs at the same 3 times for several ...
1
vote
0answers
43 views

Comparing the difference in change in repeated measures ordinal variables between two groups

I have two groups of patients, those with (OSA) and those without (nOSA) sleep apnoea. Patients were scheduled to undergo a surgical procedure (Sx). Each patient completed a type of quality of life ...
0
votes
1answer
78 views

Tests of within subjects contrasts in R

I have run a split splot model in SPSS (via repeated measures function) and I would like to reproduce my results using R. To do so I used ezANOVA function from ez package to obtain sphericity tests ...
0
votes
0answers
11 views

two measures at each ordinal variable category

I have an repeated measure (4 total measures) variable of severity, but two measures are high severity and two measures are low severity. I want to test the difference between high and low severity. ...
0
votes
0answers
11 views

slowing down effect

I am looking for an algorithm or function to look at the difference in reaction times after negative feedback. The problem is that I need to consider just the times in which negative feedback came ...
0
votes
0answers
79 views

Mixed model, repeated measures, nested?, nominal data

I am not sure how to approach the statistical analysis of the following study. Any insights would be greatly appreciated. Thanks! So, I have two independent groups, group A and group B. I am ...
1
vote
0answers
15 views

Comparing groups using SPSS

I have a dataset with 2 measures that were tested over 30 time points. I have a two groups of people who have both measures at all 30 time points. How do I compare the groups using SPSS?
1
vote
1answer
165 views

How do I “nest” data in a mixed-effects model? and MANY related questions about mixed effects models!

I treated 80 people with drug X and 80 with drug Y. I presented the drugs to them in groups of 10 (meow groups). The drug was consumed for 15 weeks. They reported the severity of their headaches (from ...
0
votes
0answers
82 views

repeated measures ANOVA with covariate

I conducted a repeated measures ANOVA and added a continuous covariate. Now there is a significant main effect of that continuous covariate. If I report that main effect I need to say something about ...
1
vote
0answers
40 views

Linear Mixed Models with variable time points in SPSS

I am analyzing a clinical study measuring patients' symptoms and brain structure sizes over three time points. The "visits" should be at baseline, 3 months and 12 months but they vary considerably and ...
1
vote
1answer
91 views

Statistically prove the effectiveness of a treatment using GLM repeated measurements

I have two lots of samples: one is the control lot and the other undergoes some treatment. I did three measurements for the samples: one at the initial time (T1) ...
1
vote
0answers
125 views

Which graphs are best suited to visualize multiple pre- and post-test scores between multiple groups?

I have a relatively small sample ($N = 64$) with the following variables: ScoreA_I: continuous pre-test response variable ...
1
vote
1answer
89 views

Confidence interval does not include 0, but Wilcoxon test is sgnificant

I've created an error plot with CI 95% to visualize the difference (post test - pre test) between achieved scores. n = 64 Judging from the confidence intervals one could conclude that there's is ...
1
vote
0answers
102 views

SPSS: How to decompose interactions in repeated measures ANCOVA?

I conducted a study with three categorical within-factors and one continuous personality variable: topic (1,2) x gain loss framing (1,2) x achievement security framing (1,2) x personality I know how ...
1
vote
0answers
64 views

I'm stuck: How to 'bin' multiple binary outcome variables and then analyze within subject?

I have what feels like it should be a very easy analysis to work out, but I've been trying for hours and I can't figure it out. I'm using SPSS by the way. I have 10 (5 of each group) different binary ...
1
vote
0answers
27 views

Need help with proper syntax for SPSS Mixed [closed]

I am having trouble building my model properly, and I was hoping I could get some advice here. I have a 2 (S: P vs. D) x 3 (ET: CA vs. CO vs. AD) between-subjects design. Participants were run in ...
0
votes
0answers
62 views

SPSS/Stata Repeated Measures - Contrast question

I have data from 8 subjects collected at 5 time points. I would like to see if there is a difference between time points (1 + 2) and (3 + 4 + 5) using either SPSS or Stata. When in SPSS I use ...
0
votes
1answer
145 views

Grouping subject data for within-subject analysis in SPSS

I have over 30 subjects who each did the same task about 50 times. Each of these data point can be in condition a1 or a2 of variable A or condition b1, b2, b3 or b4. So for each subject, I have ...
3
votes
2answers
147 views

Is a repeated measures ANOVA appropriate for multiple within-subject measurements?

I recorded 4 groups of captive birds (each group a difference species) at the same 3 times each day for 15 days. I want to determine if there is a difference in their vocalization properties such as ...
1
vote
1answer
109 views

What is the correct ANOVA for repeated measures with multiple measurements for each within-subject factor?

In Andy Field's example for one-way ANOVA with repeated measures, he measures "retching time" for eight different celebrities eating four different gross foods. He tests things like sphericity, runs ...
0
votes
0answers
24 views

Repeating ANOVA analysis after dropping one factor: different means

I had to repeat the analyses after dropping out one of the between-subject factors (order of the questionnaires) and the new means I got for other effects were different from those I had before. Can ...
1
vote
0answers
19 views

Repeated measures ANOVA with unbalanced data [duplicate]

I am a master's student, and I need your help. I did experiment on one group of rats, the group was tested during 8 days, this is the first stage. The same group was also tested again but this time ...
1
vote
0answers
105 views

SPSS GLMM Data Structure setup advice

I am running an analysis looking at individual voter turnout where it is a 1 for voting and 0 for not voting. I have some information on individuals including age, gender, and several years of past ...
0
votes
1answer
114 views

How do I model repeated measure + random effects with SPSS mixed

I'm having trouble understanding what a correct model for my data should be, and also if it would even be a good idea to make it a single model. At the basis it is a rather simple regression model ...
0
votes
2answers
595 views

Dataset of repeated measures with unbalanced sample size and unequal variace - What to do?

I have a dataset of three groups of cells treated with 10 different compounds and am not sure how to check for significant differences between those treatments. Within each group the data is also ...
2
votes
0answers
43 views

Which model for data which has within-effects, between effects and non-parallel lines

My data (Panel, 19 countries, 7 years, ordinal outcome variable) has within-effects (countries over time), between effects (between countries) and it seems as if the slope of lines (test of parallel ...
0
votes
0answers
171 views

Customizing a Split-Plot Model in SPSS

I am having a little trouble with SPSS in a rather complex design. I have to analyze an experiment with 1 within factor and 3 between factors. I don't want to test all possible effects (just the 4 ...
2
votes
0answers
82 views

If I compare conditions within two preexisting groups is that a quasi-experimental design?

I have two groups of participants, one group of psychosis patients and one group of controls. All of the participants complete a computer task that has three different conditions. So, I want to make ...
0
votes
3answers
527 views

Unequal sample sizes for two-way repeated measures

I have 3 different treatments with the observations of 6 different repetitions. However, all these different treatments (groups) have different numbers of patients. The first group has 26 patients, ...
0
votes
0answers
422 views

How do I check for normality prior to using a Mixed Anova?

I have just conducted an experiment in which I have measured glucose concentration in patients (4 different treatment groups) at 3 different weeks ( pre, 6 weeks and 12 weeks). I want to use Mixed ...
0
votes
1answer
162 views

Personality traits as fixed vs. random effects in a repeated measures mixed model

We performed a randomized controlled trial. I am interested in anxiety levels (dependent), treatment (meds vs. ultra-dance therapy), and personality variables (agreeableness, neuroticism, weeaboo). We ...
4
votes
0answers
170 views

Interpretation of mixed model with repeated measures

I have performed the following experiment: Two genotype groups of two different ages were monitored in the presence of three drugs one after the other. So, each subject after a control period received ...
3
votes
0answers
158 views

Is it possible for my mixed model results to be the same as those for a repeated measures ANCOVA? Why don't I get the same results? SPSS

The experiment: Two groups of children perform tasks with three levels of difficulty at two different time points and brain activity is measured. All of the children perform all of the tasks and do so ...
2
votes
1answer
215 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
185 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
29 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
495 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 ...