STA 2122 Lecture Notes - Lecture 2: Measuring Instrument
Document Summary
Validity problems: describes an indicator of a concept. Reliability: the quality of a measuring instrument that would cause it to report the same value in successive observations of a given case. Composite measures: measurements of variables that combine two or more indicators of the variable. Multiple indicators: several questions about the same concept. Nominal variables: simply name the different attributes constituting them. Ordinal variables: arrange those attributes in some order. Ratio variables: share all the qualities associated with nominal and ordinal variables. Interval variables: quality of standard interval measurements but lack a genuine zero point. Discrete variables: variables whose values are completely separate from one another.
