h1: Detection hazard function 'h1' prob(detect | available at...

In david-borchers/LT2D: Line transect estimation in two dimensions

Description

This hazard function has the form k(r,y)=a*r^(-b) from Hayes and Buckland (1983) p36. Note: This function uses x for perp. dist., they use y.

Usage

h1(y, x, b)

Arguments

y	Forward distance
x	perpendicular distance
b	parameter vector, where b[2] is log(theta), and the function returns theta[1]*(y^2+x^2)^(-theta[2]/2).

Value

probability of detection given that an animal is availabe at location x,y

References

Hayes, R. J., and S. T. Buckland. "Radial-distance models for the line-transect method." Biometrics (1983): 29-42.

See Also

h2, ghy, ghy2

Examples

h1(0.5,0.5,b=log(c(0.001,1)))

david-borchers/LT2D documentation built on Aug. 17, 2020, 1:37 a.m.