Comparison of Given and Calculated number of boards per tree.

Age of Tree	Calc # boards	Given# boards
20	1	1
40	6	6
60	16	N/A
80	33	33
100	58	56
120	91	88
140	134	N/A
160	187	182
180	251	N/A
200	326	320

The calculated number of boards per tree versus the given number of boards per tree are very close. An error analysis can be made where the absolute value of the calculated number of boards subtracted from the given number of boards, divided by the given number of boards all multiplied by a factor of 100.

 

%error = 100*ABS( calculated number of boards - given number of boards) / given # boards

%error
0
0
N/A
0
3
3
N/A
2

A percent error less than 5% is a good indicator that the right trendline and equation were chosen in interpolating the data.

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