SchnuteRichards {FSA} R Documentation

## The five-parameter growth function from Schnute and Richards (1990).

### Description

The five-parameter growth function from Schnute and Richards (1990). Note that this function is slightly modified (a ‘+’ was changed to a ‘-’ so that the ‘a’ parameter will be positive) from the original in Schnute and Richards (1990)

### Usage

```SchnuteRichards(t, Linf = NULL, k = NULL, a = NULL, b = NULL, c = NULL)
```

### Arguments

 `t` A numeric vector of ages over which to model growth. `Linf` Mean asymptotic length. `k` The "growth coefficient" with units of (year^(-c)). `a` A dimensionless parameter `b` A dimensionless parameter. `c` A dimensionless parameter.

### Value

`SchnuteRichards` returns a predicted size given the provided parameter values.

### IFAR Chapter

None specifically, but 12-Individual Growth is related.

### Author(s)

Derek H. Ogle, derek@derekogle.com

### References

Schnute, J.T. and L.J. Richards. 1990. A unified approach to the analysis of fish growth, maturity, and survivorship data. Canadian Journal of Fisheries and Aquatic Sciences. 47:24-40.

See `vbFuns`, `GompertzFuns`, `RichardsFuns`, `logisticFuns`, and `Schnute` for similar functionality for other models.

### Examples

```## See the formulae
growthFunShow("SchnuteRichards",plot=TRUE)

## Simple examples
ages <- 1:15
s1 <- SchnuteRichards(ages,Linf=100,k=0.03,a=0.01,b=0.005,c=2)
plot(s1~ages,type="l",lwd=2)

```

[Package FSA version 0.8.26.9000 Index]