* Informations on a sample of individual pine trees;

data pines;

label dbh='the diameter of the tree at breast height'

      height='the height of the tree'

      age='the age of the tree';

      grav='a measure of the specific gravity of the tree';



   dbh    height    age    grav     weight

 ------------------------------------------

    5.7      34      10     0.409      174

    8.1      68      17     0.501      745

    8.3      70      17     0.445      814

    7.0      54      17     0.442      408

    6.2      37      12     0.353      226

   11.4      79      27     0.429     1675

   11.6      70      26     0.497     1491

    4.5      37      12     0.380      121

    3.5      32      15     0.420       58

    6.2      45      15     0.449      278

    5.7      48      20     0.471      220

    6.0      57      20     0.447      342

    5.6      40      20     0.439      209

    4.0      44      27     0.394       84

    6.7      52      21     0.422      313

    4.0      38      27     0.496       60

   12.1      74      27     0.476     1692

    4.5      37      12     0.382       74

    8.6      60      23     0.502      515

    9.3      63      18     0.458      766

    6.5      57      18     0.474      345

    5.6      46      12     0.413      210

    4.3      41      12     0.382      100

    4.5      42      12     0.457      122

    7.7      64      19     0.478      539

    8.8      70      22     0.496      815

    5.0      53      23     0.485      194

    5.4      61      23     0.488      280

    6.0      56      23     0.435      296

    7.4      52      14     0.474      462

    5.6      48      19     0.441      200

    5.5      50      19     0.506      229

    4.3      50      19     0.410      125

    4.2      31      10     0.412       84

    3.7      27      10     0.418       70

    6.1      39      10     0.470      224

    3.9      35      19     0.426       99

    5.2      48      13     0.436      200

    5.6      47      13     0.472      214

    7.8      69      13     0.470      712

    6.1      49      13     0.464      297

    6.1      44      13     0.450      238

    4.0      34      13     0.424       89

    4.0      38      13     0.407       76

    8.0      61      13     0.508      614

    5.2      47      13     0.432      194

    3.7      33      13     0.389       66