add_vif {gtsummary}

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 = label_style_sigfig(digits = 2))

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 label_style_sigfig(digits = 2).

See Also

Review list, formula, and selector syntax used throughout gtsummary

Examples

# Example 1 ----------------------------------
lm(age ~ grade + marker, trial) |>
  tbl_regression() |>
  add_vif()

# Example 2 ----------------------------------
lm(age ~ grade + marker, trial) |>
  tbl_regression() |>
  add_vif(c("aGVIF", "df"))