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AfifiClark Data Set

In Los Angeles (circa 1980), interviewers from the Institute for Social Science Research at UCLA surveyed a multiethnic sample of 294 community members for an epidemiological study of depression and help-seeking behavior among adults. AfifiClark.RData is a modified version of the data set that accompanies the textbook by Afifi and Clark (Afifi, Abdelmonem A. and Virginia Clark.  1996 [1984].  Computer-Aided Multivariate Analysis.  (3d edition.)  New York: Chapman & Hall.).

The CESD depression index was used to measure depression.  The index is constructed by asking people to respond to 20 items: "I felt I could not shake off the blues", "My sleep was restless", and so on.  For each item, respondents answered "less than 1 time per week" (score 0); "1 to 2 days per week" (score 1); "3 to 4 days per week" (score 2), or "5 to 7 days" (score 3).  Responses to the 20 items werre summed to form the CESD score (variable cesd).  Persons with a CESD score greater than or equal to 16 are classified as depressed (variable cases).
 
Variables
id Subject identification number
sex 1 = male; 2 = female
age Age in years at last birthday
marital 1 = never married; 2 = married; 3 = divorced; 4 = separated; 5 = widowed
educat
(numeric)		 1 = less than high school; 2 = some high school; 3 = finished high school; 4 = some college; 5 = finished bachelor's degree; 6 = finished master's degree; 7 = finished doctorate
employ 1 = full time; 2 = part time; 3 = unemployed; 4 = retired; 5 = houseperson; 6 = in school; 7 = other
income Thousands of dollars per year
relig 1 = Protestant; 2 = Catholic; 3 = Jewish; 4 = None; 5 = Other
cesd CESD score
cases 1 = normal; 2 = depressed (cesd >= 16)
drink 1 = yes, regularly; 2 = no
health General health? 1 = excellent; 2 = good; 3 = fair; 4 = poor
regdoc??? 1 = yes, 2 = no
treat??? 1 = yes, 2 = no
beddays??? 1 = yes, 2 = no
acuteill??? 1 = yes, 2 = no
chronicill Any chronic illness in last year?  0 = no; 1 = yes
educat.f
(factor)		Educational attainment: 1 = lt HS; 2 = some HS; 3 = HS grad; 4 = some col; 5 = col grad; 6 = master; 7 = doctor