PSYC 2018H Lecture Notes - Lecture 4: Mental Chronometry, Antisocial Personality Disorder, Impulsivity

• School: Trent University
• Department: Psychology
• Course: PSYC 2018H
• Professor: Kevin Peters

Document Summary

Reliability (cid:862)the e(cid:454)te(cid:374)t to (cid:449)hi(cid:272)h (cid:373)easures of the sa(cid:373)e phe(cid:374)o(cid:373)e(cid:374)o(cid:374) are (cid:272)o(cid:374)siste(cid:374)t a(cid:374)d repeata(cid:271)le; (cid:373)easures high i(cid:374) relia(cid:271)ilit(cid:455) (cid:272)o(cid:374)tai(cid:374) a (cid:373)i(cid:374)i(cid:373)u(cid:373) of (cid:373)easure(cid:373)e(cid:374)t error(cid:863) If a measure is not reliable, it is difficult to know what a score on the measure actually means: observed score = true score (we want to maximize) + measurement error (we want to minimize) High measurement error = low reliability: reliability is necessary, but not sufficient i(cid:374) order to ha(cid:448)e a (cid:862)good(cid:863) (cid:373)easure. Validity (cid:862)i(cid:374) ge(cid:374)eral, the e(cid:454)te(cid:374)t to (cid:449)hi(cid:272)h a (cid:373)easure of (cid:454) trul(cid:455) (cid:373)easures (cid:454) a(cid:374)d (cid:374)ot (cid:455) (cid:894)e. g. , a (cid:448)alid (cid:373)easure of i(cid:374)tellige(cid:374)(cid:272)e (cid:373)easures i(cid:374)tellige(cid:374)(cid:272)e a(cid:374)d (cid:374)ot so(cid:373)ethi(cid:374)g else(cid:863) Ratio scales measurement scale in which numbers refer to quantities and intervals are assumed to be of equal size; a score of zero denotes the absence of the phenomenon being measured: temperature celsius internal.