Classify the following variables as dichotomous, nominal, ordinal, continuous, or discrete numerical. Could any of them be modified to increase power, and how?
1.
A. History of heart attack (present/absent)
B. Age
C. Education (college degree or more/less than college degree)
D. Education (highest year of schooling)
E. Race
F. Number of alcohol drinks per day
G. Depression (none, mild, moderate, severe)
H. Percent occlusion of coronary arteries
I. Hair color
J. Obese (BMI ≥ 30)/non-obese (BMI<30)