Prevalence caluction can fail

[dirkschumacher]

Not sure yet what causes it but certain combinations in the gregion can lead to the following error

Error in family$linkfun(mustart) : 
  Argument mu must be a nonempty numeric vector

Maybe too few observations?

[dirkschumacher]

library(anthro)
res <- anthro_prevalence(
  sex = c(1, 1, 1, 1, 1, 2),
  age = c(1001, 1000, 1010, 1000, 300),
  weight = c(18, 15, 10, 15, 15),
  lenhei = c(100, 80, 100, 100, 100)
)
#> Error in family$linkfun(mustart): Argument mu must be a nonempty numeric vector

^{Created on 2019-02-22 by the reprex package (v0.2.1)}