Find Sequential Exclusions Due to NAs
seqFreq(..., labels = NULL, noneNA = FALSE)factor variable with obs.per.numcond attribute
any number of variables
if specified variable labels will be used in place of variable names
set to TRUE to not include 'none' as a level in the result
Frank Harrell
Finds the variable with the highest number of NAs. From the non-NAs on that variable find the next variable from those remaining with the highest number of NAs. Proceed in like fashion. The resulting variable summarizes sequential exclusions in a hierarchical fashion. See this for more information.