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| VCF COMPUTATION METHOD | |
|---|---|
| CODE | DESCRIPTION |
| 1 - 10,15,20 | Number of years pooled for a crew area |
| H | Average over all years for a crew area |
| A | Average over all years, all crew areas |
| PY | Last year's or some previous year's value |
| Historically, other codes have been used to identify special circumstances throughout the years. They are below. | |
| CODE | DESCRIPTION |
| 1* | Special method for crew area 1, American green-winged teal, in 1996 |
| 1A | Special method for crew area 3, strata 34, 35, and 39, in 1996 |
| 1B | Special method for crew area 3, strata 36, 37, 38, and 40, in 1996 |
| 96 | Special method used for Canada geese in eastern crew areas |
| Av | Special methods for eastern crew areas, similar to "A" in that it averages over all crew areas |
| BU | Bayesian update |
| E2,E3,E5,E6,E9 | Special bootstrapping method for eastern crew areas |
| IMPUTATION CODES | |
| CODE | DESCRIPTION |
| 0 | No imputation performed |
| 1 | Imputation for missing value |
| 2 | Imputation for outlying value |
| 3 | Variance imputation only (1 transect)
|
Smith, G. W. 1995. A Critical review of the aerial and ground surveys of breeding waterfowl in North America. Biological Science Report 5, National Biological Service, Washington, D.C., USA.
Note: More detailed information can be obtained on imputation codes by referring to:
Chief, Population and Habitat Assessment Branch
Division of Migratory Bird Management
U.S. Fish and Wildlife Service
11510 American Holly Drive
Laurel, MD 20708