[LONGITUDINAL]
input = {V, k, a}

EQUATION:
f = 100/V*exp(-k*t)

DEFINITION:
y = {distribution = normal, prediction = f, sd = a}

;----------------------------------------------
[INDIVIDUAL]
input = {V_pop, omega_V, beta, w, w_pop}

EQUATION:
V_pred = V_pop*(w/w_pop)^beta

DEFINITION:
V = {distribution = lognormal, prediction = V_pred, sd = omega_V}

;----------------------------------------------
[COVARIATE]
input = {w_pop, omega_w}

DEFINITION:
w = {distribution = normal, mean = w_pop, sd = omega_w}

