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Anova terminology

Between subjects (aka nested factors)

a subject is assigned to only one factor level of treatment

problem: greater variability, requires more subjects

Within subjects (aka crossed factors)

subjects assigned to all factor levels of a treatment

requires fewer subjects

less variability as subject measures are paired

problem: order effects (eg learning)

partially solved by counter-balanced ordering

Qwerty

S1-20

Dvorak

S21-40

Alphabetic

S41-60

Keyboard

Qwerty

S1-20

Dvorak

S1-20

Alphabetic

S1-20

Keyboard

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