Flashcards in Repeated Measures ANOVA Deck (18)

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1

## What is a Repeated Measures ANOVA?

### When there are 3+ within-subject conditions. Looking at differences.

2

## What is a strength of a Repeated Measures ANOVA?

### No increase of Type I Error (family-wise error).

3

## What is a disadvantage of a Repeated Measures ANOVA?

### Can determine if there's a difference but not which conditions actually differ. Need follow-up tests for this.

4

## What is a weakness of a T-Test?

### The family-wise error. Each additional T-Test increases chance of Type I error.

5

## Define systematic variation & unsystematic variation.

###
Systematic variation is the variation due to our manipulation.

Unsystematic variation is the variation due to random factors.

6

## What is the concept behind an ANOVA?

### It breaks down the total variance (systematic + unsystematic) and compares the two sources.

7

## When do we know that the IV affected the DV?

### When the systematic variation is larger than the unsystematic variation.

8

## What is SSbc?

### The estimated variation in scores between conditions.

9

## What is SSwc?

### The estimated variation in scores within conditions.

10

## What is SSbs?

### The estimated variation in scores between participants.

11

## How do you calculate DFbc?

### k-1. Where k is the number of conditions.

12

## How do you calculate DFerror?

### (n-1)(k-1). Where k is the number of conditions.

13

## How do you calculate F?

### F = MSbc / MSerror. Where MSbc is SSbc / DFbc and MSerror is SSerror / DFerror.

14

## What does a large F-value show?

### That a large ratio of our variance is due to our manipulation.

15

## What is sphericity?

### Assumption that the variance of difference between pairs of conditions is the same.

16

## What test is used to test for sphericity?

### Mauchly's Test (must be non-significant).

17

## What results do you read off if sphericity isn't met?

### Greenhouse-Geisser.

18