Introductory Biostatistics

the usefulness of acid phosphatase as a prognostic variable, we need a more
detailed analysis before a conclusion can be made.

9.1 SIMPLE REGRESSION ANALYSIS

Following the outline of Chapter 8, in this section we discuss the basic ideas of
simple regression analysis when only one predictor or independent variable is
available for predicting the response of interest. Again, the response of interest
is binary taking the value 1 with probabilitypand the value 0 with probability
1
p. In the interpretation of the primary parameter of the model, we discuss

TABLE 9.1

X-ray Grade Stage Age Acid Nodes X-ray Grade Stage Age Acid Nodes

0116440000060780

0016340000052830

1006546000167950

0106747000056980

00066480001611020

01165480000641870

0006049010158481

0005149000165491

0006650011157511

0005850001050561

0105650011067671

0016150000167671

0116450001157671

0005652001145701

0006752000146701

1004955010151721

0115255011160761

0006856011156781

0116659011150811

1006062000056821

0006162000163821

1115963011165841

0005165010164891

0115366001059991

00058710111681261

00063750100611361

00153760

Note:This is a very long data file; its electronic copy, in a Web-based form, is available from the
author upon request.

316 LOGISTIC REGRESSION