Module 2: 2.1: Displaying and Summarizing Categorial Data

Categorical Data provides:

1) The values being observed

2) How often each value occurred

Relative frequency

percentage of the frequency that the category appears in the data set

Bar Chart:

shows the frequencies or percent in the different categories

Pie Chart:

displays relationship between parts and whole

Contingency table

shows relationship between 2 categorical variables

Contingency table cells:

gives count for a combination of the two variables

Contingency table margins:

give totals and frequency distributions for each of the variables; marginal distribution

Contingency table: conditional distribution

shows distribution of one variable for just the individuals who satisfy some condition on another variable

Independent variables

conditional distribution of one variable is the same for each category: no association between

Segmented Bar Chart

same info as pie chart but in the form of bars