inc
either a numeric vector giving the
(equivalized disposable) income, or (if data
is
not NULL
) a character string, an integer or a
logical vector specifying the corresponding column of
data
.
weights
optional; either a numeric vector giving
the personal sample weights, or (if data
is not
NULL
) a character string, an integer or a logical
vector specifying the corresponding column of
data
.
years
optional; either a numeric vector giving the
different years of the survey, or (if data
is not
NULL
) a character string, an integer or a logical
vector specifying the corresponding column of
data
. If sup