PS268 Lecture Notes - Categorical Variable, Count Data
Document Summary
Ps296 week 1 lecture notes (introduction and basic concepts) The assignment of numbers to objects. translating information about attributes or characteristics of cases into numbers: constant. A number that does not change in value in a given situation: variables. Properties of objects or events that can take on different values. Types of variables: categorical variables (qualitative variables) Variables that divide cases into different groups or categories; measurement involves assigning arbitrary numbers to different categories: quantitative variables. Variables that involve the measurement of some attribute; measurement involves real numerical values: discrete variables. Variables that take on a small set of possible values. Variables that involve measurement along a continuum. Types of data: categorical data (frequency data, count data) Data representing counts or number of observations in each category: measurement data (quantitative data) Data obtained by measuring objects or events. Set of actual observations; subset of a population: population. Complete set of events in which you are interested.
