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