contingency tables

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Presentation Description

How to construct a two-by-two contingency table for cross tabulation.

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Presentation Transcript

Two-by-Two : 

Two-by-Two Contingency Table

From the : 

From the headlessprofessor

Rules: each case : 

Rules: each case must go into a cell

Rules: each case : 

Rules: each case must go into a cell can only go into one cell

Separate Groups : 

Separate Groups Rows for I.V. or predictor

Separate Groups : 

Separate Groups Rows for I.V. or predictor: Male vs. Female

Separate Groups : 

Separate Groups Rows for I.V. or predictor: Male vs. Female Pass vs. Fail

Separate Groups : 

Separate Groups Rows for I.V. or predictor Columns for D.V. or criterion

Separate Groups : 

Separate Groups Rows for I.V. or predictor Columns for D.V. or criterion Vote YES or NO

Separate Groups : 

Separate Groups Rows for I.V. or predictor Columns for D.V. or criterion Vote YES or NO PASS or FAIL test

What percent of : 

What percent of The experimental group passed?

What percent of : 

What percent of The experimental group passed? 100 X A/(A+C)

What percent of : 

What percent of The experimental group passed? 100 X A/(A+B) 100 X 15/20 = 75%

What percent of : 

What percent of The control group passed?

What percent of : 

What percent of The control group passed? 100 X C / (C+D)

What percent of : 

What percent of The control group passed? 100 X C / (C+D) 100 X10 / 30 = 33%

Repeated Measures : 

Repeated Measures Two raters Two times

Repeated Measures : 

Repeated Measures Two raters Interviewers Quality judges

Repeated Measures : 

Repeated Measures Two raters Two times Before vs. After

What percent of : 

What percent of Cases had it the first time?

What percent of : 

What percent of Cases had it the first time? 100 X A / (A+C)

What percent of : 

What percent of Cases had it the first time? 100 X A / (A+C) 100 X 8/10 = 80%

What percent of : 

What percent of Cases had it the second time?

What percent of : 

What percent of Cases had it the second time? 100 X A / (A+C)

What percent of : 

What percent of Cases had it the second time? 100 X A / (A+C) 100 X 8/15 = 53%

Two-by-Two : 

Two-by-Two Contingency Table

From the : 

From the headlessprofessor

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