| Table 6. �Contingency matrix and calculated errors for
the thematic accuracy assessment of the vegetation association map of
Friendship Hill National Historic Site. |
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| Accuracy Assessment Observation |
Mapped Vegetation Association |
Total |
Error of Comission (% correct) |
| Conifer
Plantation |
Early Successional Hardwood
Forest |
Mixed Forb Marsh |
Northern Red Oak - Mixed
Hardwood Forest |
Successional Old Field |
Sycamore Floodplain Forest |
Tuliptree - Beech - Maple
Forest |
| Conifer
Plantation |
2 |
|
|
|
|
|
|
2 |
100.00% |
| Early
Successional Hardwood Forest |
|
7 |
|
1 |
|
|
|
8 |
87.50% |
| Mixed
Forb Marsh |
|
|
2 |
|
|
|
|
2 |
100.00% |
| Northern
Red Oak - Mixed Hardwood Forest |
|
|
|
3 |
|
|
1 |
4 |
75.00% |
| Successional
Old Field |
|
|
|
|
6 |
|
|
6 |
100.00% |
| Sycamore
Floodplain Forest |
|
|
1 |
|
|
5 |
|
6 |
83.30% |
| Tuliptree
- Beech - Maple Forest |
|
|
|
4 |
|
|
14 |
18 |
77.80% |
| Developed
Land |
|
|
1 |
|
|
|
|
1 |
N/A |
| Total |
2 |
7 |
4 |
8 |
6 |
5 |
15 |
47 |
� |
| Error
of Omission |
100.00% |
100.00% |
50.00% |
37.50% |
100.00% |
100.00% |
93.30% |
|
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| (%
correct) |
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Total Points
Correct |
39 |
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Overall Accuracy |
83.00% |
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|
Kappa Index |
78.80% |
|
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|
|
90% confidence
interval for Kappa Index |
10.90% |
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|
Biological Informatics Program 
U.S. Department of the Interior |
U.S. Geological Survey
