Tagged Questions

1
vote
0answers
207 views

G*Power-Repeated measures MANOVA “number of measurements” input field

I am trying to calculate the sample size needed with G*Power for my dissertation study. I will be doing a Repeated Measures MANOVA within/between interaction. My question is in the field "number of ...
0
votes
0answers
77 views

Sample size power and sensitivity

I'm building a multinomial ordinal logistic regression model in SAS. Here is some description: I've an ordinal response variable (has 4 levels) and 3 categorical covariates (each one has different ...
0
votes
0answers
127 views

Sample Size determination - cross over study with repeated measures

I am working on the sample size determination for cross-over study. The aim of this study is to measure reliability of the measurements of outcome variable (continuous). For example, There will be 50 ...
2
votes
0answers
64 views

What are good values to assume for correlation and sphericity when estimating sample size for a within-subjects design

I am planning a within-subjects study with four different conditions and I am using G*Power to calculate my needed sample size. Not being intimately acquainted with the intricacies of statistics in ...
2
votes
1answer
159 views

Repeated measures ANOVAs instead of repeated measures MANOVA w/ small N?

I have 3 variables that have been measured on 4 occasions and a sample size of 16. I was considering a repeated measures MANOVA to ascertain if the changes over time were statistically significant. ...
3
votes
2answers
337 views

How to describe study design looking at effect of a training program on two age groups and how do I calculate required sample size?

I am conducting an experiment on comparing the training effects on young and older adults (meaning it will be 2 independent groups). This also means it will be a repeated measure (within groups) ...
5
votes
3answers
5k views

What is a minimum sample size for a paired t-test and what is a non-parametric equivalent if data is non-normal?

I have 4 sample pairs, let's say (x1, y1),...,(x4, y4). What is the minimum sample size for a paired t-test? Which assumption should I check for paired t-test? If my data is non-normal, what is an ...
6
votes
0answers
594 views

How to use G Power 3 to calculate statistical power in mixed design ANOVA with unequal group sample sizes

In G power 3, ANOVA repeated measures within-between interaction: Only the total sample size is reported assuming equal sample size for the two groups. My questions are: How would it work if the ...
4
votes
0answers
173 views

Is repeated measures ANOVA appropriate for my experiment and is my sample size large enough?

I'm really confused. I never took statistics but am trying to read up as much as I can. I didn't think much about statistical analysis until after doing the experiment, unfortunately, but maybe ...
8
votes
1answer
657 views

Sample size for proportions in repeated measures

I'm trying to help a scientist design a study for the occurrence of salmonella microbes. He would like to compare an experimental antimicrobial formulation against a chlorine (bleach) at poultry ...
11
votes
2answers
8k views

How to determine the sample size needed for repeated measurement ANOVA?

I need some help about repeated measurement ANOVA. We are investigating the effect of some intervention on reducing blood stream infection (BSI) rate in some wards. We plan to capture the BSI rate ...