HW 8
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Homework 8. ODDS RATIOS
Conduct data analyses
1.
Use the online calculator at
http://statpages.org/ctab2x2.html
to
conduct odds ratio analyses
for the following sets of
variables: PHYS/MENTHLTH2 by (a) SLEEP2, (b) CHECKUP2, (c)
SMOKER, and (d) EXERCISE
How to conduct odds ratio analyses using the online calculator at
http://statpages.org/ctab2x2.html
INSERT THE CORRECT VALUES IN THE OBSERVED CONTINGENCY TABLE
Observed Contingency Table
Outcome Occurred
Outcome did not Occur
Totals
Risk Factor Present
or Dx Test Positive
= a
= b
= r1
Risk Factor Absent
or Dx Test Negative
= c
= d
= r2
Totals
= c1
Confidence Level:
95
%
Compute
o
From the output in HW 7 (whether from Excel or SOFA), PUT THE RIGHT NUMBERS IN THE RIGHT CELLS
Outcome occurred: PHYS/MENTHLTH2=1; Outcome did not occur: PHYS/MENTHLTH2=2
Risk factor present: Sleep=30 days; checkup=within the last year; smoker=no; exercise=yes
o
Make sure “Confidence Level” = 95
o
Then hit “Compute”
o
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 Fall '09
 STACY
 ChiSquare Test, Chisquare distribution, Pearson's chisquare test, Test Chi Square, Outcome Occurred Outcome

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