KIN330 Lecture Notes - Lecture 2: Discriminant, Intraclass Correlation, Inter-Rater Reliability
26 Dec 2017
School
Department
Course
Professor
Document Summary
Definition: measurement numerals to variables: process of assigning numerals to variables to represent quantities of characteristics according to certain rules, describes physical or behavioural characteristics according to their quantity, degree, capacity, or quality. Rules of measurement: dictate how numerals are assigned to data, sometimes measurement scales are standardized kg, meters, degrees, sometimes this is not the case frequency counts, proportions, questionnaires, no one specific way to measure these variables. Types of measurement scales: nominal lowest level of precision, categories of no order; arbitrary categorization, more common for abstract variables, e. g. , male = 0, female = 1, ordinal reporting on a scale. Measurement error: systematic error, predictable error, occurs in one direction, should be recalibrated or adjusted for, does not threaten reliability, random error, unpredictable error, due to chance, threatens reliability, regression towards the mean. If extreme scores are caused by random error, then they will tend to regress towards the mean upon re-test.
