Enhancing reliability and error in evaluation

Reliability

Enhancing Reliability

Common errors in performance appraisals/evaluation

ENHANCING RELIABILITYSeveral test characteristics affect reliability

Enhancing reliability

Construct items and task clearly

Sufficient number of items or task in a test

Appropriate test difficulty

Enhancing reliability

Sufficient time limits in test

Less influence of extraneous events or factors

Continue assessment until result are consistent

Enhancing reliability

Use independent raters or observers who provide similar score to the same performance (NO BIAS).

COMMON ERRORS IN PERFORMANCE APPRAISALS/EVALUATION

Leniency/generosity error

• The tendency to evaluate all people as outstanding rather than true assessments of performance.

Severity error

• Tendency to evaluate all people as poor in the assessment performance. Usually has a high standard than the others.

Central-tendency error

• The reluctance to give extreme ratings, either positive or negative.

Halo effect error

• The tendency to make inappropriate generalizations from one aspect of a person’s job performance.

Contamination effect

• Happens when Raters include nonperformance factors like race, gender, hair color, etc. into an appraisal

Reference:

• http://www.regent.edu/acad/global/publications/rgbr/vol1iss1/performance_appraisals.shtml

• http://www.referenceforbusiness.com/management/Em-Exp/Employee-Evaluation-and-Performance-Appraisals.html

• http://smartchurchmanagement.com/performance-appraisal-rater-errors/#sthash.ol8V2pQh.dpuf

• Mc millian, J.H. 1997 classroom assesment