A character scalar or vector listing deprivation measures
to return. These include the area deprivation index ("adi"),
the gini coefficient ("gini"), two versions of the neighborhood
deprivation index by Messer ("ndi_m") and Powell and Wiley
("ndi_pw"), and four versions of the social vulnerability
index ("svi10", "svi14", "svi20", and "svi20s").