blorr: blr_step_p_both – R documentation

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blr_step_p_both

Stepwise regression

Description

Build regression model from a set of candidate predictor variables by entering and removing predictors based on p values, in a stepwise manner until there is no variable left to enter or remove any more.

Usage

blr_step_p_both(model, ...)

## Default S3 method:
blr_step_p_both(model, pent = 0.1, prem = 0.3, details = FALSE, ...)

## S3 method for class 'blr_step_p_both'
plot(x, model = NA, print_plot = TRUE, ...)

Arguments

`model`	An object of class `lm`; the model should include all candidate predictor variables.
`...`	Other arguments.
`pent`	p value; variables with p value less than `pent` will enter into the model.
`prem`	p value; variables with p more than `prem` will be removed from the model.
`details`	Logical; if `TRUE`, will print the regression result at each step.
`x`	An object of class `blr_step_p_both`.
`print_plot`	logical; if `TRUE`, prints the plot else returns a plot object.

Value

blr_step_p_both returns an object of class "blr_step_p_both". An object of class "blr_step_p_both" is a list containing the following components:

`model`	final model; an object of class `glm`
`orders`	candidate predictor variables according to the order by which they were added or removed from the model
`method`	addition/deletion
`steps`	total number of steps
`predictors`	variables retained in the model (after addition)
`aic`	akaike information criteria
`bic`	bayesian information criteria
`dev`	deviance
`indvar`	predictors

References

Chatterjee, Samprit and Hadi, Ali. Regression Analysis by Example. 5th ed. N.p.: John Wiley & Sons, 2012. Print.

Examples

## Not run: 
# stepwise regression
model <- glm(y ~ ., data = stepwise)
blr_step_p_both(model)

# stepwise regression plot
model <- glm(y ~ ., data = stepwise)
k <- blr_step_p_both(model)
plot(k)

# final model
k$model


## End(Not run)

blorr

Tools for Developing Binary Logistic Regression Models

v0.3.0

MIT + file LICENSE

Authors

Aravind Hebbali [aut, cre] (<https://orcid.org/0000-0001-9220-9669>)

Initial release