Psych 325 1st Edition Lecture 9-Correlation coefficientoStrength and direction-Internal consistencyoUsed whenever multiple items are combined to create a score-Common with self-report scales-Can be used with observationsoAre the items in a scale measuring the same thing?-High correlation with each other means items are similar-Low correlation means items aren't consistent with each otherBad measureMeasuring different constructsCan't understand items-More items leads to better reliabilityMore indicatorsLess vulnerable to chanceoi.e. depression: -Feel sad .80-Feel blue-Tired .82-Can't sleep -No appetite-Trouble concentrating-Lonely-Temporal consistencyoUsed whenever you assess something that doesn't change on a regular basis-Scores shouldn't change over time-Doesn't apply to things like moodoTest-retest reliability: over short time spans (i.e. two weeks), do you get the same score?-High correlation=consistency-Low correlation means the score is changing over timeConstruct may not be tableMay be vulnerable to mood effectsMay be difficult to understand items-Focus on major personality traitsoHappy mood=bad temporal consistency/very unstable-Assessing construct validity in scalesoConstruct validity is also important in judging measuresoIs the measure assessing what we want it to?oWe assess construct validity by These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.-Correlating it with other measures-Analyzing pattern of correlationsoPredictive validity-Is the measure useful?-Does it correlate with any useful outcome measures?-Depression: people are more likely to have a heart-attackCryHeadachesPoor academic performanceSuicidal tendenciesSelf-harmoConvergent Validity: related to other
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