© 2015 M. Guthrie Yarwood

Estimating Reliability

Test-Retest Coefficient

Parallel-Forms Coefficient

Internal Consistency Coefficient

Interrater (interobserver) Reliability

© 2015 M. Guthrie Yarwood

Test-Retest Coefficient

Time 1: Extraversion Test September 1, 2015Time 2: Extraversion Test October 1, 2015

correlate

© 2015 M. Guthrie Yarwood

Parallel Forms Coefficient

Time 1: Extraversion Form A September 1, 2015Time 2: Extraversion Form B October 1, 2015

correlate

© 2015 M. Guthrie Yarwood

Internal Consistency Coefficient

Item #1Item #2Item #3Item #4

© 2015 M. Guthrie Yarwood

Internal Consistency Coefficient

Item #1

Item #2

Item #3

Item #4

correlate

correlate

Item #1

Item #2

Item #3

Item #4

Item #1

Item #2

Item #3

Item #4

© 2015 M. Guthrie Yarwood

Interrater Reliability

Participant#1

Participant #2

Participant #3

Participant #4

Coder #1

4.5 4.6 4.8 4.7

Coder #2

4.8 4.9 4.7 4.6

Coder #3

2.0 1.5 2.3 5.0