PSCH 242 Study Guide - Midterm Guide: The Literary Digest, Field Experiment, Nonprobability Sampling
Document Summary
Define and describe the concept of reliability of a measure, including its relationship to the term random measurement error. Reliability - consistent results when the measurement is repeated under the identical conditions. If a measurement is reliable, consistent results ensure that any small, random errors that could be occurring while the measure is being taken are minimal. Describe three types of reliability: test-retest reliability, inter-rater reliability, and internal reliability. Identify when it is appropriate to use each of these types of reliability. Test-retest reliability - consistent results after every remeasure. Interrater reliability - consistent results no matter who is observing. Internal reliability - consistent results no matter how you ask. Explain how to visually present reliability data with scatterplots, and how to quantify reliability data with a pearson r correlation coefficient or percent agreement. Explain how to apply this general approach to each of the three types of reliability: test-retest reliability.
