FRHD 3070 Lecture Notes - Lecture 4: Electrical Contacts, Inter-Rater Reliability, Observational Error

• School: University of Guelph
• Department: Family Relations and Human Development
• Course: FRHD 3070
• Professor: John Dwyer

Document Summary

Week 4: measurement and scale development & midterm. Sequence of steps or procedures that a researcher follows to obtain a measurement. Concrete: giving a concrete set of ingredients and procedure. Don"t want to be too crude and broad or too specific. Observed score = true score + systematic error + random error. A written test score has all of these components but the instructor only sees the true score. Nominal: numbers that they wear on their shirt. Ordinal: labelling someone on their level of smoking (heavy) Scoring high on one variable and scoring low on another. Degree to which observed scores are free from errors of measurement. Ex. bathroom scale sometimes has poor or high reliability: test-retest reliability. Looking at the stability of a concept over time. Ex. correlation between two scores over time. Interpreting a low correlation (instrument is not reliable or concept has changed) Interpreting a high correlation (shortening the time frame)