`discrim_quad()`

defines a model that estimates a multivariate
distribution for the predictors separately for the data in each class
(usually Gaussian with separate covariance matrices). Bayes' theorem is used
to compute the probability of each class, given the predictor values. This
function can fit classification models.

There are different ways to fit this model, and the method of estimation is chosen by setting the model *engine*. The engine-specific pages for this model are listed below.

More information on how parsnip is used for modeling is at https://www.tidymodels.org/.

## Arguments

- mode
A single character string for the type of model. The only possible value for this model is "classification".

- regularization_method
A character string for the type of regularized estimation. Possible values are: "

`diagonal`

", "`shrink_cov`

", and "`shrink_mean`

" (`sparsediscrim`

engine only).- engine
A single character string specifying what computational engine to use for fitting.

## Details

This function only defines what *type* of model is being fit. Once an engine
is specified, the *method* to fit the model is also defined. See
`set_engine()`

for more on setting the engine, including how to set engine
arguments.

The model is not trained or fit until the `fit()`

function is used
with the data.

Each of the arguments in this function other than `mode`

and `engine`

are
captured as quosures. To pass values
programmatically, use the injection operator like so:

```
value <- 1
discrim_quad(argument = !!value)
```