When the variables are labeled with the wave number,
what should separate the variable name and wave number? By default,
it is "_". In other words, a variable named var will be
var_1, var_2, and so on in the wide data frame.
ignore.attributes
If the data was created by long_panel(),
it stores information about which variables vary over time and which
are constants. Sometimes, though, this information is not accurate (
it is only based on the wide data's variable names) and you may want to
force this function to check again based on the actual values of the
variables.
varying
If you want to skip the checks for whether variables are
varying and specify yourself, as is done with stats::reshape(), you
can supply them as a vector here.
Details
This is a wrapper for stats::reshape(), which is renowned for being
pretty confusing to use. This function automatically detects which of the
variables vary over time and which don't, not appending wave information
to constants.