PSC 1 3.measurement

PSC 1 3.measurement - 1 VALIDITY ISSUES AND MEASUREMENT...

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Unformatted text preview: 1 VALIDITY ISSUES AND MEASUREMENT SCALES Measuring Behavior Lecture Outline & Measuring Variables & Scales of Measurement & Research example 2 Measuring variables & Some things can be directly measured & Behavioral & Physiological & Self-Report & Some things can not be directly measured & Create a measure that assess and approximates the variable of interest (the construct) 2 Measuring variables & Almost all measurements include some degree of error or noise & We must evaluate the accuracy and consistency of the measurement Validity and Reliability & Validity (accuracy) & Webster: soundly based on facts or evidence & Reliability (consistency) & If the characteristic being measured is stable, a reliable test yields consistent results A construct & A construct is a hypothetical variable which is not directly observable & Intelligence & Happiness & Estimate the participants level of the construct by asking multiple questions & Operational definition becomes very Important 3 Anxiety OBSERVABLE EVENTS HYPOTHESIZED CONSTRUCT No opportunity for escape Unfamiliar situation/change Threat of aversive event Physiological measures: Sweating Increased heart rate Increased blood pressure Rapid, shallow breathing Behavioral measures: Inhibited behavior (unable to perform simple tasks) Pacing, rapid eye movements, startle-reflex Stammering, other speech problems Other indicators: Responses to anxiety assessment Expressed need...
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This note was uploaded on 01/27/2012 for the course PSC 41 taught by Professor Nitzberg during the Spring '07 term at UC Davis.

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PSC 1 3.measurement - 1 VALIDITY ISSUES AND MEASUREMENT...

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