/*--------------------------------------------------------------*
 *           Data on tree diameter vs. age                      *
 *                                                              *
 * Diameter of n=27 oak trees grown on a poor site and age in   *
 * years was recorded by Chapman & Demeritt, 1936.              *
 * Source: S. Weisberg, Applied Regression Analysis, Wiley, 1980*
 *--------------------------------------------------------------*/
Title 'Tree Data from Weisberg';
data tree;
     label age= 'Age (years)'
           diam='Diameter at breast height (in.)';
     input Age Diam;
cards;
 4 0.8
 5 0.8
 8 1.0
 8 2.0
 8 3.0
10 2.0
10 3.5
12 4.9
13 3.5
14 2.5
16 4.5
18 4.6
20 5.5
22 5.8
23 4.7
25 6.5
28 6.0
29 4.5
30 6.0
30 7.0
33 8.0
34 6.5
35 7.0
38 5.0
38 7.0
40 7.5
42 7.5
;
Proc print;