Decision Tree: More Than Two Related Groups

You may use

One-Way Repeated Measures ANOVA

Doing one-way repeated measures ANOVA using:

• SPSS
• MS-Excel
• VassarStats' Online Statistical Calculation page
  

Journal Article:

• "Effects Of Two Levels Of Caffeine Doses On Endurance Performance Of Normal Young Black African Subjects?" by Lamina & Musa (2008) [html]