View source: R/key_functions.R
half_norm_key | R Documentation |
This function provides the half normal key function for model fitting in distance sampling.
half_norm_key(x, sigma)
x |
vector of perpendicular distances from the transect. |
sigma |
scale parameter. |
This is the half normal key function with parameter
sigma
. Its expression is given by
g(x) = \exp(\frac{-x^2}{2*\sigma^2},
for x > 0.
A numeric value corresponding to a given value of x
and
sigma
.
Jaime Mosquera GutiƩrrez, jmosquerag@unal.edu.co
Other key functions:
hazard_rate_key()
,
uniform_key()
library(EstimationTools)
#----------------------------------------------------------------------------
# Example: Half normal function
half_norm_key(x=1, sigma=4.1058)
curve(half_norm_key(x, sigma=4.1058), from=0, to=20, ylab='g(x)')
#----------------------------------------------------------------------------
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