Expected survival and the survival quotient
The dependent variable in the analysis was the survival
quotient which was derived through a comparison of observed
and expected survival. The estimation of survival for each
of the 30 individuals who were interviewed was made using the
selected regression equation for each of the three cancer
sites. Table 23 summarizes the demographic and regression
data.
Table 23
Summary of Demographic and Regression Data for the Three
Cancer Sites
Site
Datum Lung Breast Rectocolon
N 214 96 142
Median Survival 5 25 12
Range 43 77 72
No. of predictor variables 4 2 2
R .58 .67 .45
R .34 .45 .20
SE .82 .73 1.04
Years of diagnosis 1979,80 1976,77,78 1977,78,79
The estimation of survival for the 12 lung cancer
patients in the sample was based on a regression model with
four predictor variables. Estimation for the 12 breast
cancer cases and the 6 rectocolon cases was based on models
with two predictor variables each.