Logistics management class lectures_161602024-lec12

Jul 29th, 2015
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1212ODDS RATIOS FOR MULTI-LEVEL FACTORS; EXAMPLESOdds Ratios for Multi-level Factors; ExamplesThe Framingham StudyThe Framingham study was a prospective (follow-up, cohort) study of the occurrence of coronaryheart disease (CHD) in Framingham, Mass. The study involved 2187 men and 2669 women agedbetween 30 and 62. More details on the study are given as a supplement to the lecture. Variablesand values of the variables are as follows:Variable NameGenderAge GroupSCL (Serum Cholesterol)CHD (Coronary Heart Disease)FreqCodes0 = Female, 1 = male0 is 30-49, 1 is 50-621 is < 190, 2 is 190-219, 3 is 220-249, 4 is 250+1 is Yes, 0 is NoCountI will consider a simple analysis of the association between serum cholesterol level (SCL) at thestart of the study and whether a subject had, or developed CHD, during the 12 year follow-upperiod. A table with Stata analysis of counts relating CHD to SCL is given below.. tabulate chd scl [fw=frequency],chi2 lrchi2 exp col+--------------------+| Key||--------------------||frequency|| expected frequency || column percentage |+--------------------+|SCLCHD |1234 |Total-----------+--------------------------------------------+---------0 |1,0221,2031,1191,125 |4,469|978.31,169.71,127.41,193.6 |4,469.0|96.1494.6591.3586.74 |92.03-----------+--------------------------------------------+---------1 |4168106172 |387|84.7101.397.6103.4 |387.0|3.865.358.6513.26 |7.97-----------+----

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