Calculate growth/decay rate

## Usage

```
growth_rate(x, ...)
# S3 method for default
growth_rate(x, ...)
# S3 method for incidence2_fit
growth_rate(
x,
alpha = 0.05,
growth_decay_time = TRUE,
include_warnings = FALSE,
...
)
```

## Arguments

- x
The output of

`fit_curve()`

.- ...
Not currently used.

- alpha
Value of alpha used to calculate confidence intervals; defaults to 0.05 which corresponds to a 95% confidence interval.

- growth_decay_time
Should a doubling/halving time and corresponding confidence intervals be added to the output. Default TRUE.

- include_warnings
Include models in output that triggered warnings but not errors. Defaults to

`FALSE`

.