TREE.DOC
Explanation of data
file - Tree.dat
File name: Tree.doc
Units: English
This file provides an explanation of the data
files contained in tree.dat. Data has
been collected from permanent plots for 12 inventories (12, 15, 16, 19, 24, 27,
30, 35, 36, 37, 40, and 43).
TREE.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 crown ratio.
10. Tree Doyle log rule volume.
11. Tree International 1/4-inch log rule volume.
12. Tree cubic foot volume.
13. Plot
quadratic mean diameter at breast height before thinning (DB) (in inches).
14. Plot quadratic mean diameter at breast
height after thinning (DA) (in inches).
15. Plot average mean total height (height
corresponding to
DB) before thinning
(in feet).
16. Plot average mean total height (height
corresponding to DA) after thinning (in feet).
17. Plot crown ratio before thinning (arithmetic
mean). Contains trees that have ice
storm damage.
18. Plot crown ratio after thinning (arithmetic
mean) Contains trees that have ice storm damage.
19. Number
of trees per acre before thinning (NB).
20. Number of trees per acre after thinning (NA)
(because of thinning and mortality NA is not always equal to NB and current NB
is always equal to last NA.). The same is true for plot diameters and heights.
Example:
1 44
50 50 24
68.9 13.5 35.0
0.4920 108.00 181.10
35.90 13.02 14.28
66.98 68.04 52.17
53.84 100 40
Number of
observations: 18096
The following code
can be used to input tree.dat into SAS:
data tree ; infile 'c:/tree.dat' ; input pn tn tba pr
age h d hcb cr doyle inter cubic db da hb ha crb cra nb na ; run ;