/*
Data collected on a simple random sample of 32 births.

Source: Table 9.6.1 in Daniel's text "Biostatistics"

variables
------------------------------------

ID_No      1 to 32

B_Weight   Birthweight (grams)

G_Age      Gestational Age (weeks)

Smoke      Smoking Status of Mother
           0 = Nonsmoker  1 = Smoker
*/

OPTIONS LS=75 PS=40;

DATA sasuser.bwdata;
INPUT ID_No B_Weight G_Age Smoke;
LINES;
 1 2940  38  1
 2 3130  38  0
 3 2420  36  1
 4 2450  34  0
 5 2760  39  1
 6 2440  35  1
 7 3226  40  0
 8 3301  42  1
 9 2729  37  0
10 3410  40  0
11 2715  36  1
12 3095  39  0
13 3130  39  1
14 3244  39  0
15 2520  35  0
16 2928  39  1
17 3523  41  0
18 3446  42  1
19 2920  38  0
20 2957  39  1
21 3530  42  0
22 2580  38  1
23 3040  37  0
24 3500  42  1
25 3200  41  1
26 3322  39  0
27 3459  40  0
28 3346  42  1
29 2619  35  0
30 3175  41  1
31 2740  38  1
32 2841  36  0
;
PROC REG;
  MODEL B_Weight = G_Age Smoke;
RUN;