AF Section 3.1 SP09 handouts

AF Section 3.1 SP09 handouts - STAT 2000 Association...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
1 STAT 2000 Sections 3.1 Two Categorical Variables Statistics: The Art and Science of Learning from Data Agresti-Franklin Association between two Categorical Variables Lived Died Contingency Table Was survival associated with class? First Class 202 123 Second Class 118 167 Third Class 178 528 Crew 212 673 Association between two Categorical Variables Explanatory Variable: Class on the Titanic Values: 1 st , 2 nd , 3rd, Crew Response Variable: Survival Values: Lived or Died Is smoking associated with lung cancer? Explanatory Variable and values: Response Variable and values: Association We say there is an association if a particular value for one variable is more likely to occur with certain values of another variable. Ex: Was a passenger more likely to live if the passenger was in a higher class? Was a passenger in Crew more likely to die? To answer these questions, we use conditional proportions or percentages. Conditional proportions (or percentages) tell us how likely a passenger was to live if the passenger was in first class, if the passenger was in second class, etc.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 3

AF Section 3.1 SP09 handouts - STAT 2000 Association...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online