intro to measurement notes

measurement

process of assigning numbers to characteristics or attributes of our cases based on rules

levels of measurement

nominal, ordinal, interval, ratio

reliability

consistency in people’s scores across measures, administrations, items, judges, ratings

validity

how well a measure assesses what it’s intended to measure

goals of psychology

describe, explain, predict, control

psychology

the scientific study of mental processes and behavior

trait

inherently true about someone, stable over time (ex: personality)

state

things/conditions/characteristics that change rapidly (ex: mood)

quantifiable

able to be measured or expressed numerically. to use some sort of process to assign numbers to differences based on predetermined rule