TREE48.DOC

Explanation of data file – Tree48.dat

File name: Tree48.doc

Units: English

This file provides an explanation of the data files contained in Tree48.dat. Data has been collected from permanent plots for 14 inventories (12, 15, 16, 19, 24, 27, 30, 35, 36, 37, 40, 43, 45, and 48).

TREE48.DAT

Variables:

1. Plot number

2. Tree number

3. Target Basal Area(sq. ft./acre). They are 30, 50, 70, 90, and 150. Note that 150 is not basal area but a code which indicates control plots.

4. Pruning Level (%). 25, 40, and 50 indicate that crowns were pruned to 25, 40 and 50 percent of the total tree height (age 12 and age 15). 100 is a code indicating no pruning.

5. Age - age of trees from seed.

6. Total tree height - TTH (in feet).

7. Tree DBH (in inches).

8. Tree height to crown base - HCB (in feet).

9. Tree cubic foot volume before thinning (in cubic feet).

10. Age at last recorded measurement.  Except for year 48, this would indicate the last known year of survivability for a given tree.

Example:

1     40     50     50     12     39.8     6.7      18         4.8      30
1     40     50     50     15     46.4     8.1      23         8.6      30
1     40     50     50     16     46.2     8.9      23       11.2      30

Number of observations: 6500

The following code can be used to input tree48.dat into SAS:

data tree ; infile 'c:/tree48.dat' ; input pn tn tba pr age h d hcb cubic alr; run ;