Unformatted text preview: Individual: Object described by a set of data. Individuals may be people, but they may also be animals or things. Variable: Any characteristic of an individual. A variable can take different values for different individuals. Categorical variable: A variable that places each individual into a category. Quantitative variable: A variable that takes numerical values that measure some characteristic of each individual, like height in centimeters or salary in dollars per year. Exploratory data analysis: Use of graphs and numerical summaries to describe the variables in a data set and the relations among them. 1. Begin by examining each variable by itself. Then move on to study the relationships among the variables. 2. Begin with a graph or graphs. Then add numerical summaries of specific aspects of the data. Distribution: The values and the frequency of values taken by a variable. The values of a categorical variable are labels for the categories. The distribution of a categorical variable lists the categories and gives either the count or the percent of individuals who fall in...
View
Full Document
 Winter '11
 PattiColling
 Leftwing politics

Click to edit the document details