Content Disclaimer
Copyright @2020.
All Rights Reserved.
StatsToDo : Sample Size for Comparing Means in Multiple Groups
(One Way Analysis of Variance)

Links : Home Index (Subjects) Contact StatsToDo

Explanations Javascript Program R Codes Sample Size Tables
Data
Sample Size is a table of 5 columns
  - Each row contains data from a separate study
  - Col 1 = Probability of Type I Error (α)
  - Col 2 = Power (1-β)
  - Col 3 = The Number of Groups in the study
  - Col 4 = Maximum Difference Between Any Two Groups to be Detected
  - Col 5 = Expected within group Standard Deviation
     

Power Estimation is a table of 5 columns
  - Each row contains data from a separate study
  - Col 1 = Probability of Type I Error α
  - Col 2 = Averaged numbers per group used
  - Col 3 = The Number of Groups in the study
  - Col 4 = Maximum Difference Between Any Two Groups observed
  - Col 5 = Observed within group SD (sqrt(observed esidual variance))
     

Pilot is for a single plan, a single column with 5 rows
  - Row 1 : Probability of Type I Error usually 0.05
  - Row 2 : The Number of Groups in the study
  - Row 3 : Largest Difference Between Groups to be detected
  - Row 4 : Expected within group or population Standard Deviation
  - Row 5 : Sample size interval for tabulation of changing values of Power
  - Row 6 : Maximum sample size for tabulation of changing values of Power