gtsummary: add_vif – R documentation

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add_vif

Add Variance Inflation Factor

Description

Add the variance inflation factor (VIF) or generalized VIF (GVIF) to the regression table. Function uses car::vif() to calculate the VIF.

Usage

add_vif(x, statistic = NULL, estimate_fun = NULL)

Arguments

`x`	`'tbl_regression'` object
`statistic`	`"VIF"` (variance inflation factors, for models with no categorical terms) or one of/combination of `"GVIF"` (generalized variance inflation factors), `"aGVIF"` 'adjusted GVIF, i.e. `GVIF^[1/(2*df)]` and/or `"df"` (degrees of freedom). See `car::vif()` for details.
`estimate_fun`	Default is `style_sigfig()`.

Example Output

Example 1

Example 2

Examples

# Example 1 ----------------------------------
if (requireNamespace("car")) {
  add_vif_ex1 <-
    lm(age ~ grade + marker, trial) %>%
    tbl_regression() %>%
    add_vif()
}

# Example 2 ----------------------------------
if (requireNamespace("car")) {
  add_vif_ex2 <-
    lm(age ~ grade + marker, trial) %>%
    tbl_regression() %>%
    add_vif(c("aGVIF", "df"))
}

gtsummary

Presentation-Ready Data Summary and Analytic Result Tables

v1.4.0

MIT + file LICENSE

Authors

Daniel D. Sjoberg [aut, cre] (<https://orcid.org/0000-0003-0862-2018>), Michael Curry [aut] (<https://orcid.org/0000-0002-0261-4044>), Margie Hannum [aut] (<https://orcid.org/0000-0002-2953-0449>), Joseph Larmarange [aut] (<https://orcid.org/0000-0001-7097-700X>), Karissa Whiting [aut] (<https://orcid.org/0000-0002-4683-1868>), Emily C. Zabor [aut] (<https://orcid.org/0000-0002-1402-4498>), Esther Drill [ctb] (<https://orcid.org/0000-0002-3315-4538>), Jessica Flynn [ctb] (<https://orcid.org/0000-0001-8310-6684>), Jessica Lavery [ctb] (<https://orcid.org/0000-0002-2746-5647>), Stephanie Lobaugh [ctb], Gustavo Zapata Wainberg [ctb] (<https://orcid.org/0000-0002-2524-3637>)

Initial release