Measurement Concepts

# Measurement Concepts - DP Home Notes Ch.5 Measurement...

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DP Home Notes: Ch.5 Measurement Concepts Reliability of Measures - Reliability refers to the consistency or stability of a measure of behavior - A reliable measure of a psychological variable such as intelligence will yield the same result each time you administer the intelligence test to the same person - A reliable measure does not fluctuate from one reading to the next - Any measure that you make can be thought of as comprising two components: o 1. True score: which is the real score on the variable o 2. Measurement error: an unreliable measure of intelligence contains considerable measurement error and so does not provide an accurate indication of an individual’s true intelligence - The measurement error in the unreliable test is revealed in the greater variability shown by the person who took the unreliable test - Reliability is most likely to be achieved when researchers use careful measurement procedures - Increased by making multiple measures - We cannot directly observe the true score and error components of an actual score on the measure - We can assess the stability of measures using correlation coefficients - Most common correlation coefficient when discussing reliability is the Pearson product-moment correlation coefficient o A PCC that relates the two scores should be a high positive correlation Test-Retest Reliability - Test-retest reliability is assessed by measuring the same individuals at two points in time - High reliability is indicated by a high correlation coefficient showing that the two scores are very similar - Obtaining two measures from the same people at two points in time may sometimes be difficult Internal Consistency Reliability - Internal consistency reliability

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