PSYB01H3 Lecture Notes - Lecture 4: Discriminant, Construct Validity, Face Validity
Document Summary
Mid-term: 50 m/c, 2 short answer/essay (can be answered in point form), covers chapters 1- 5, appendix a, and chapter 1 of tri-council policy. Same result over and over: x1 t + e1. Reliability: proportion of true scores in a measure but characteristic of a measure taken across individuals: look at variance in scores across subjects. Refer to diagram to right: less error for reliable measure. Don"t know true scores, so can"t calculate reliability of true scores; must estimate. Assume measured scores (x) related to each other to the degree that they share true scores. Estimate of reliability = correlation between two scores of the same measure. Correlation coefficients called regression coefficients (reliability coefficient) used for ratio and interval scales: coefficients range from 0. 00 to -1. 00 and 0. 00 to +1. 00. Variables co-vary in opposite direction (-1. 00 0. 00) Variables co-vary in the same direction (0. 00 - +1. 00) Will always range between 0 and 1 o.
