Analysis

 The determination of survival expectations involved the

development of three linear regression equations that were

used to predict the survival of individuals with cancer of

the lung, breast, or rectocolon.

 The development of the equations included the analysis

of three separate sets of data, each of which consisted of

biological, medical, and disease information on one of the

three cancer sites being studied. As previously noted, these

analyses were based on 266 cases of lung cancer, 101 cases of

breast cancer, and 166 cases of rectocolon cancer. The data

were derived exclusively from the medical abstracts. Table 3

summarizes the variables identified for this analysis and

gives the scale of measurement of each.



Table 3

Predicting Survival: Independent and Dependent Variables


Variables Scale of Measurement

Independent
 Age Continuous
 Sex Categorical
 Race Categorical
 Stage Continuous
 Histology Categorical
 Initial treatment Categorical
 Subsequent Treatment Categorical

Dependent
 Survival Continuous