Hello all, can we estimate sample size for simple mediational model (One IV, one Mediator, and one DV) with the help of G Power? Please help me to select the option in G power. Or can we use some other software for this? thank you!
Yes, you can use G*Power to estimate the sample size for a simple mediational model. Here's a step-by-step guide:
Step 1: Open G*Power and select the correct test
Open G*Power and select "F tests" from the list of statistical tests. Then, choose "Linear multiple regression: Fixed model, R^2 increase" as the specific test.
Step 2: Specify the effect size
In the "Effect size" section, you need to specify the effect size for the mediational model. You can use the following guidelines:
- Small effect size: f^2 = 0.02
- Medium effect size: f^2 = 0.15
- Large effect size: f^2 = 0.35
You can also use the "Calculate and plot effect sizes" option to determine the effect size based on your research question.
Step 3: Specify the alpha and power levels
Set the alpha level (usually 0.05) and the power level (usually 0.80 or 0.90).
Step 4: Specify the number of predictors
In the "Number of predictors" section, enter the number of predictors in your model, which is 2 (IV and mediator).
Step 5: Calculate the sample size
Click "Calculate" to determine the required sample size.
Dear Sir, thank you for providing step-by-step solutions to calculate the effect size. However, as I understand, this way we can calculate the effect sizes for multiple regression analysis. Can this way we do for mediation analysis also?
Deepak Kumar, how about moderation analysis (one or two moderators, including or excluding control variables)? Same path?
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