[Feature Request]: Enhancement to Power module

[49er60]

Description

Add estimated sample standard deviation field to Parameters field of the Power module

Purpose

The sample size calculation depends on the relationship between the "Minimal effect size of interest" and the estimated standard deviation.

Use-case

Calculations of sample size when the standard deviation differs from 1.

Is your feature request related to a problem?

The current calculation is only valid for a standard deviation of 1. If the standard deviation is greater, the sample size would also be greater.

Is your feature request related to a JASP module?

Power

Describe the solution you would like

Add estimated sample standard deviation to Parameters field of the Power module and revise the calculations to include the estimated standard deviation.

Describe alternatives that you have considered

No response

Additional context

[tomtomme]

@49er60
thx for the report. This is a misunderstanding. Our Power module wants Cohens delta whicht is equal to (mean difference / SD). So if you put SD =2 into your program, you get Cohens delta = 0.25. Put that in JASPs power module and the results will be the same again.

Note:
Most programs prefer entering cohens delta instead of mean difference and SD, because it is harder to pinpoint 2 values than 1, that are still interesting enough to be researched.
So make sure not to put in sample mean-diff and sample SD in there, but the smallest mean-diff and the biggest SD you would still find interesting enough to invest your research time in. See? Much harder even to formulate than questioning oneself for the lowest cohens delta you still find acceptable to spend your research time on.