[INDIVIDUAL]
input = {a_pop, o_a, b_pop, o_b, c_pop, o_c, r_ab, r_ac, r_bc}
DEFINITION:
a = {distribution=lognormal,   reference=a_pop, sd=o_a}
b = {distribution=normal,      reference=b_pop, sd=o_b}
c = {distribution=logitnormal, reference=c_pop, sd=o_c}
correlation = {r(a,b)=r_ab, r(a,c)=r_ac, r(b,c)=r_bc}

[LONGITUDINAL]
input={a, b, c}
EQUATION:
f = a + b*t + c*t^2
