Returns the age-interpolated median of the GCDG references (Weber
et al, 2019). The working range is 0-4 years. This function is used
to set prior mean under keys "gcdg" and "gsed1912".
count_mu_gcdg(t)A vector of length length(t) with the median of the GCDG references.
Internal function. Called by dscore()
dscore:::count_mu_gcdg(0:2)
#> [1] 3.308477 49.244553 62.480171