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Counting snow geese

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Keywords:
flock, birds
Categories:

biology;
generalized linear models

Description:

To estimate the number of snow geese over Hudson Bay, small aircraft flew over the Bay and an ``experienced person'' estimated the number of geese any flocks found. To test the reliability of this method, two experienced observers estimated the number of geese per flock, and a photograph of the flock was also taken. The number of geese were later counted from the photograph

There are 45 observations (the number of flocks) on three variables.

Variables:
Photo The number of geese counted from the photograph
Obs1 The number of geese estimated by Observer 1
Obs2 The number of geese estimated by Observer 2
Data Quality:

There are no missing values.

Source:

Weisberg, Sanford (1985). Applied Linear Regression, 2nd Edition, John Wiley, 1985 (p 102).

Notes: The data show increasing variance.

References:

The data come from Cook, R. D. and Jacobsen, J. O. (1978). Analysis of 1977 West Hudon Bay snow goose survey. Unpublished report, Canadian Wildlife Service.