PSYC 202 Lecture Notes - Lecture 19: Time Point, Standard Deviation, Observational Error
Document Summary
The specific method used to measure or manipulate a variable. Different operational definitions can lead to different results. Most classical approaches assume that the raw score (x) of any one individual is made up of: true score (t, a random error (e) component: x = t + e. A hypothetical score that represents an assessment result which is entirely free of error. 1. (i. e. , the actual amount the person posses ) As opposed to the score the individual obtained on the measure itself (x) Measurement error (e) represents the degree to which a measurement deviates from the true score value (t). If a single student were to take the same test repeatedly (with no new learning taking place between tests and no memory of question effects) The standard deviation of his/her repeated test scores is denoted as the standard error of measurement (sem) As the reliability of a test increases, the sem decreases; as reliability decreases, the.
