When you create a summary table for either model or basic
summary stats in R, you usually end up having column names in the form of
"a_mean", "a_sd", "b_mean" and "b_sd". This function streamlines the process
of renaming these column names and adding extra header rows using
add_header_above.
header_separate(kable_input, sep = "[^[:alnum:]]+")Output of knitr::kable() with format specified
A regular expression separator between groups. The default value is a regular expression that matches any sequence of non-alphanumeric values.