Linear regression sample size calculator

one varaince test tutorial

F distribution

Normal distribution right tailed

Test calculation

Calculates the sample size to gain the required test power and draw a power analysis chart for the following models:
Simple Linear Regression
Multiple Linear Regression

You may hover the chart to see the power value per each sample size value.

Statistic Data

Digits:example digits=2: (0.001234 => 0.0012)
α:Significant level (0-1), maximum chance allowed rejecting H0 while H0 is correct (Type1 Error)
Power:Required test power
You plan the test to be able to identify this effect. If one exists, the test should reject the null hypothesis, the regression model provides a better fit than Y=b0. effect size f2 - examples:
0.02 - small effect, 0.15 - medium , 0.35 - large
R2 - the coefficient of multiple determination.
Prefictors:The number of potential predictors

validation message