PSYB04H3 Lecture Notes - Lecture 4: Level Of Measurement, Content Analysis, Content Validity
Document Summary
Interval equal intervals, no meaningful zero: standardized measurements designed to be created so there is an equal interval but 0 doesn"t mean the absence of something. If you have zero money you have no money. If something does not exist: talking about things that 0 means the absence of. In order to be accurate, it has to be reliable: three possibilities, reliable but no valid, ex. setting your clock a head for the same time every day, but it"s not accurate. If something is biased it could be reliable but not valid: reliable and valid, unreliable and hence not valid, no such thing as something that is valid but not reliable, the nature of measurement. Interrater reliability consistency across multiple observers: test-retest reliability consistency across multiple time points. Internal reliability (sometimes called internal consistency) consistency across multiple items. Assessing reliability: reliability coefficients vary between 0 1, cronbach"s alpha (a) most common used with internal reliability.
