The simple saddlepoint approximation (SSA) uses the mean, variance, and skewness (a measure of the asymmetry of the distribution) of a data set to algebraically approximate the probability density function of a selected variable. We compared habitat-suitability bounds estimated with SSAs and continuous selection functions. Habitat-suitability bounds for bobwhite nesting based on the SSA method were biologically comparable to the results of the method based on continuous selection functions. The SSA approach allows habitat-suitability bounds to be estimated using algebra and can be calculated in computer spreadsheets.
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1 April 2011
Application of the Simple Saddlepoint Approximation to Estimate Probability Distributions in Wildlife Research
Stephen J. Demaso,
Fidel Hernández,
Leonard A. Brennan,
Ralph L. Bingham
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Journal of Wildlife Management
Vol. 75 • No. 3
April 2011
Vol. 75 • No. 3
April 2011
Colinus virginianus
habitat suitability
northern bobwhite
probability distribution
simple saddlepoint approximation
Skewness
variance