Optionally, unquoted variable names/expressions separated by
commas to be passed to dplyr::select(). Otherwise, all columns are
included if formula and vars are also NULL.
formula
A formula, like the one you'll be using to specify your model.
vars
As an alternative to formula, a vector of variable names.
min.waves
What is the minimum number of observations to be kept?
Default is "all", but it can be any number.
Value
A panel_data frame.
Details
If ... (that is, unquoted variable name(s)) are included, then formula
and vars are ignored. Likewise, formula takes precedence over vars.
These are just different methods for selecting variables and you can choose
whichever you prefer/are comfortable with. ... corresponds with the
"tidyverse" way, formula is useful for programming or working with
model formulas, and vars is a "standard" evaluation method for when you
are working with strings.