View source: R/Misc_Exported.R
hconv | R Documentation |
Convert stock recruit parameters from steepness parameterization to alpha/beta (and vice versa)
hconv(alpha, phi0, SR = 1, type = 1)
R0conv(alpha, beta, phi0, SR = 1, type = 1)
SRalphaconv(h, phi0, SR = 1, type = 1)
SRbetaconv(h, R0, phi0, SR = 1, type = 1)
alpha |
Alpha parameter |
phi0 |
Unfished spawners per recruit |
SR |
Stock-recruit function: (1) Beverton-Holt, or (2) Ricker |
type |
The parameterization of the Beverton-Holt function with respect to |
beta |
Beta parameter |
h |
Steepness parameter |
R0 |
Unfished recruitment parameter |
The Type 1 Beverton-Holt equation is
R = \alpha S/(1 + \beta S)
The Type 2 Beverton-Holt equation is
R = S/(\alpha + \beta S)
The Ricker equation is
R = \alpha S \exp(-\beta S)
A numeric.
hconv()
: Returns steepness (h) from alpha
and phi0
R0conv()
: Returns unfished recruitment (R0) from alpha
, beta
, and phi0
SRalphaconv()
: Returns alpha
from h
and phi0
SRbetaconv()
: Returns beta
from h
, R0
, and phi0
Q. Huynh
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