The comparisons of this family read Statistics Canada's quality flags:
E (use with caution), and F, x, .., ...
(no value: too unreliable, suppressed, not available, not applicable). Other
agencies flag otherwise: the Australian Bureau of Statistics np (not
published) and * or ** (relative standard error over 25% or
50%), Stats NZ S (suppressed), the US Census Bureau (X). This
maps them to the package's vocabulary, so suppressed cells are never compared
and uncertain ones are marked.
Usage
qltyrcd(x, suppr = c("F", "x", "..", "..."), caution = "E")