# What is number of measurements in G power?

## What is number of measurements in G power?

“Number of measurements” is simply the number of levels in your within-subject factor/repeated measure. So if you collected data at 4 different time points for example, the number of measurements would be 4.

### How do you determine how many participants you need for a study?

All you have to do is take the number of respondents you need, divide by your expected response rate, and multiple by 100. For example, if you need 500 customers to respond to your survey and you know the response rate is 30%, you should invite about 1,666 people to your study (500/30*100 = 1,666).

What is two way repeated measures Anova?

The Two-Way Repeated-Measures ANOVA compares the scores in the different conditions across both of the variables, as well as examining the interaction between them.

What is correlation among repeated measures?

Repeated measures correlation (rmcorr) is a statistical technique for determining the common within-individual association for paired measures assessed on two or more occasions for multiple individuals. Rmcorr estimates the common regression slope, the association shared among individuals.

## What is a repeated measures factor?

Repeated-measures means that the same subject received more than one treatment and or more than one condition. When one of the factors is repeated-measures and the other is not, the analysis is sometimes called a mixed-model ANOVA (but watch out for that word mixed, which can have a variety of meanings in statistics).

### What is two way repeated measures ANOVA?

How do you calculate effect size for power analysis?

Generally, effect size is calculated by taking the difference between the two groups (e.g., the mean of treatment group minus the mean of the control group) and dividing it by the standard deviation of one of the groups.

What is power calculation for repeated-measures ANOVA?

Power calculation for repeated-measures ANOVA for between effect, within effect, and between-within interaction. Arguments Among Number of groups, Number of measurements, Sample size, Effect size, Correlation across measurements, Nonsphericity correction, significance level, and power, one and only one field can be left blank.

## Can we simulate a two-factor repeated measures ANOVA?

We can simulate a 2×2 ANOVA, both factors manipulated within participants, with a specific sample size and effect size, to achieve a desired statistical power. As Potvin and Schutz ( 2000) explain, analytic procedures for a two-factor repeated measures ANOVA do not seem to exist.

### Can G*Power do a power analysis with more than one factor?

They informed me that the current version of G*Power (3.1.9.2) cannot conveniently do power analyses for repeated measures designs with more than one within-subject or between-subject factor. It is possible using the “Generic F test” option, but this is considerably more complicated.

How do you calculate the number of groups in an ANOVA?

Assuming the “ANOVA: RM, within factors” option is where we’re at, I believe the “number of groups” refers to the number of between-subjects LEVELS (not factors) that you have. Thus if you have two between-subjects factors, one with 2 levels and one with 3, you will have 2×3=6 as your “number of groups”.

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