This section of the appendix includes instructions for computing the measures of reliability that were discussed in the narrative portion of this book. The following measures are included: coefficient-α, rater agreement, parallel forms reliability, mastery consistency, and the reliability of a composite score. Instructions for creating a composite score are presented, as well.
Computing Coefficient-α (alpha)
Coefficient-α is computed as follows:
Where: k = number of items.
Microsoft Excel can be used to manage test ...
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