The dependent variable. The dependent variable in this
series of correlation analyses was the measure of relative
survival called the survival quotient. Because this measure
was based on a comparison of predicted survival and observed
survival, this step of the analysis was not carried out until
all of the individuals interviewed had died.
The procedure used for the calculation of relative
longevity was drawn from the work of Worden, Johnston, and
Harrison (1974) and results in a measure of survival termed
the "survival quotient."
According to Weisman and Worden
(1975) the procedure can be summarized as follows:
Survival Quotient =
Observed Survival minus Expected
Survival
Standard Error of Estimate
Where
Observed
Survival
Expected Survival
SE
-est
= number of months from diagnosis
until death
= survival in months predicted by
regression equations
= standard error of estimate for
the particular site of the case
being evaluated