details_logistic_reg_glm | R Documentation |

`stats::glm()`

fits a generalized linear model for binary outcomes. A
linear combination of the predictors is used to model the log odds of an
event.

For this engine, there is a single mode: classification

This engine has no tuning parameters but you can set the `family`

parameter (and/or `link`

) as an engine argument (see below).

logistic_reg() %>% set_engine("glm") %>% translate()

## Logistic Regression Model Specification (classification) ## ## Computational engine: glm ## ## Model fit template: ## stats::glm(formula = missing_arg(), data = missing_arg(), weights = missing_arg(), ## family = stats::binomial)

To use a non-default `family`

and/or `link`

, pass in as an argument to
`set_engine()`

:

linear_reg() %>% set_engine("glm", family = stats::binomial(link = "probit")) %>% translate()

## Linear Regression Model Specification (regression) ## ## Engine-Specific Arguments: ## family = stats::binomial(link = "probit") ## ## Computational engine: glm ## ## Model fit template: ## stats::glm(formula = missing_arg(), data = missing_arg(), weights = missing_arg(), ## family = stats::binomial(link = "probit"))

Factor/categorical predictors need to be converted to numeric values
(e.g., dummy or indicator variables) for this engine. When using the
formula method via `fit()`

, parsnip will
convert factor columns to indicators.

This model can utilize case weights during model fitting. To use them,
see the documentation in case_weights and the examples
on `tidymodels.org`

.

The `fit()`

and `fit_xy()`

arguments have arguments called
`case_weights`

that expect vectors of case weights.

*However*, the documentation in `stats::glm()`

assumes
that is specific type of case weights are being used:“Non-NULL weights
can be used to indicate that different observations have different
dispersions (with the values in weights being inversely proportional to
the dispersions); or equivalently, when the elements of weights are
positive integers `w_i`

, that each response `y_i`

is the mean of `w_i`

unit-weight observations. For a binomial GLM prior weights are used to
give the number of trials when the response is the proportion of
successes: they would rarely be used for a Poisson GLM.”

This model object contains data that are not required to make predictions. When saving the model for the purpose of prediction, the size of the saved object might be substantially reduced by using functions from the butcher package.

The “Fitting and Predicting with parsnip” article contains
examples
for `logistic_reg()`

with the `"glm"`

engine.

Kuhn, M, and K Johnson. 2013.

*Applied Predictive Modeling*. Springer.

Embedding an R snippet on your website

Add the following code to your website.

For more information on customizing the embed code, read Embedding Snippets.