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Types of reliability

1. Stability.
2. Equivalence.
3. Internal consistency.
1- Stability.
(“test-retest”): the degree to which two scores on the same instrument are consistent over time.
2- Equivalence.
(“equivalent forms”): the degree to which identical instruments (except for the actual items included) yield identical scores.
3- Internal Consistency.
(“split-half” reliability with Spearman-Brown correction formula , Kuder-Richardson and Cronback’s Alpha reliabilities, scorer/rater reliability): the degree to which one instrument yields consistent results. 

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