Useful for exploratory plots.

```
cov_cov_plot(
d,
cov,
continuous,
log_transform_plot = rep(FALSE, length(cov)),
dcov_info,
by = "ID"
)
```

## Arguments

- d
Dataset with covariates.

- cov
Vector of length 2 for covariate names.

- continuous
Logical vector of length 2 for whether cov is continuous or
not.

- log_transform_plot
Should plot be log transformed or not.

- dcov_info
Optional `data.frame`

with covariate information.

- by
Character (default = `"ID"`

) variable to split over.

## Value

`ggplot2`

object displaying covariate-covariate correlations.