the name or index of the column that contains
each respondent's estimated degree
y.vals
the name or index of the column that contains
the quantity of interest. if this is a
dichotomous trait, it should be 0 / 1
missing
if "ignore", then proceed with the analysis without
doing anything about missing values. if "complete.obs"
then only use rows that have no missingness for the
computations (listwise deletion). care
must be taken in using this second option
verbose
if TRUE, print messages to the screen
Value
the RDS-II estimate of the average of the quantity of interest
Details
NOTE: we have no weights for now, right? RDS doesn't
get used with weights?