Returns the age-interpolated median of the D-score of the default reference for a given key.
count_mu(t, key, prior_mean_NA = NA_real_)
Decimal age, numeric vector
Character, key of the reference population
Numeric, prior mean when age is missing
A vector of length length(t)
with the median of the default reference
population for the key.
Do not use this function if you want the median D-score for a specific reference.
DEPRECATED in dscore 1.9.6