INTRODUCTION

Define Reliability
 

Composition of observed score
 

1. a true score and

2. error components

Some of the points in the testing process where things can occur that cause
variance other than true ability.

test development.
test administration
test scoring and interpretation.
 

TYPES OF RELIABILITY

Four major types-- two groups:

those using 2 sets of test scores test/re-test, & alternate or parallel forms,

those using one set of scores: internal consistency & inter-scorer reliability.

Let us take these one at a time.
 
 
 

A. Two sets of scores:
 

1. Test/Re-Test Reliability.

2. Parallel Forms and Alternate Forms.

B. One set of scores
 

3. Internal Consistency Reliabilities.

split-half reliability estimate.

Spearman-Brown formula
Guttman formula

Inter - item consistency

Coefficient alpha
The Kuder-Richardson Formulas (K-R 20 & K-R 21)

4. Inter-scorer reliability

Using Coefficients of Reliability
 

Choice of Type of Reliability Coefficient.

Interpretation of Reliability Coefficients

Reliability and Individual Scores - Applying Reliability Information
Standard error of measurement (SEM)

confidence intervals

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