sim_ays_covar function

Simulate age-year-space covariance

These functions return a function to use inside sim_distribution.

sim_ays_covar(
  sd = 2.8,
  range = 300,
  lambda = 1,
  model = "matern",
  phi_age = 0.5,
  phi_year = 0.9,
  group_ages = 5:20,
  group_years = NULL
)

Arguments

• sd: Variance (can be age specific).
• range: Decorrelation range
• lambda: Controls the degree of smoothness of Matern covariance process
• model: String indicating either "exponential" or "matern" as the correlation function
• phi_age: Defines autocorrelation through ages. Can be one value or a vector of the same length as ages
• phi_year: Defines autocorrelation through years. Can be one value or a vector of the same length as years
• group_ages: Make space-age-year noise equal across these ages
• group_years: Make space-age-year noise equal across these years

Returns

Returns a function for use inside sim_distribution.