make_guess_secondary {biogrowth} | R Documentation |

## Initial guesses for the parameters of a secondary model

### Description

Uses some heuristic rules to generate an initial guess of the model parameters
of secondary growth models that can be used for model fitting with
`fit_secondary_growth()`

.

### Usage

```
make_guess_secondary(fit_data, sec_model_names)
```

### Arguments

`fit_data` |
Tibble with the data used for the fit. It must have
one column with the observed growth rate (named |

`sec_model_names` |
Named character vector defining the secondary model for each environmental factor. |

### Examples

```
## We can use the example dataset included in the package
data("example_cardinal")
## We assign model equations to factors as usual
sec_model_names <- c(temperature = "Zwietering", pH = "fullRatkowsky")
## We can then calculate the initial guesses
make_guess_secondary(example_cardinal, sec_model_names)
## We can pass these parameters directly to fit_secondary_growth
fit_secondary_growth(example_cardinal,
make_guess_secondary(example_cardinal, sec_model_names),
c(),
sec_model_names)
```

[Package

*biogrowth*version 1.0.4 Index]