zwietering_gamma {biogrowth} | R Documentation |

## Zwietering gamma model

### Description

Gamma model as defined by Zwietering et al. (1992). To avoid unreasonable predictions, it has been modified setting gamma=0 for values of x outside (xmin, xopt)

### Usage

```
zwietering_gamma(x, xmin, xopt, n)
```

### Arguments

`x` |
Value of the environmental factor. |

`xmin` |
Minimum value of the environmental factor for growth. |

`xopt` |
Maximum value for growth |

`n` |
Exponent of the secondary model |

### Value

The corresponding gamma factor.

[Package

*biogrowth*version 1.0.4 Index]