Convert from mean and standard deviation to the log standard deviation of the
lognormal distribution. Useful for defining distributions supported by
`estimate_infections`

, `epinow`

, and `regional_epinow`

.

## Usage

`convert_to_logsd(mean, sd)`

## Arguments

- mean
Numeric, mean of a distribution

- sd
Numeric, standard deviation of a distribution

## Value

The log standard deviation of a lognormal distribution

## Examples

```
convert_to_logsd(2, 1)
#> [1] 0.4723807
```