Skip to main content
. Author manuscript; available in PMC: 2013 Apr 24.
Published in final edited form as: GeroPsych (Bern). 2011 Dec 1;24(4):177–185. doi: 10.1024/1662-9647/a000047

Table 1.

List of random effects model considered for the independent and joint analyses and frailty terms

Random effects models fitted
Linear random effects model (Model 1)
Proseit=α0i+α1iTit+εit (1)
α0i=α00+γ01B.agei+γ02Educi+γ03Genderi+γ04Inc.Demi+ν0i (1.1)
α1i=α11+γ11B.agei+γ12Educi+γ13Genderi+γ14Inc.Demi+ν1i (1.2)
Quadratic random effects model (Model 2):
Proseit=α0i+α1iTit+α2iTit2+εit (2)
α0i=α00+γ01B.agei+γ02Educi+γ03Genderi+γ04Inc.Demi+ν0i (2.1)
α1i=α11+γ11B.agei+γ12Educi+γ13Genderi+γ14Inc.Demi+ν0i (2.2)
α2i=α22+γ21B.agei+γ22Educi+γ23Genderi+γ24Inc.Demi+ν0i (2.3)
Fixed change point model (Model 3)
Proseit=α0i+α1iTitI(Titτ)+[α0i+α1iτ+α2i(Tit-τ)]I(Tit>τ)+εit (3)
α0i=α00+γ01B.agei+γ02Educi+γ03Genderi+γ04Inc.Demi+ν0i (3.1)
α1i=α11+γ11B.agei+γ12Educi+γ13Genderi+γ14Inc.Demi+ν0i (3.2)
α2i=α22+γ21B.agei+γ22Educi+γ23Genderi+γ24Inc.Demi+ν0i (3.3)
Random change point model (Model 4)
Proseit=α0i+α1iTitI(Titτi)+[α0i+α1iτi+α2i(Tit-τi)]I(Tit>τi)+εit (4)
α0i=α00+γ01B.agei+γ02Educi+γ03Genderi+γ04Inc.Demi+ν0i (4.1)
α1i=α11+γ11B.agei+γ12Educi+γ13Genderi+γ14Inc.Demi+ν0i (4.2)
α2i=α22+γ21B.agei+γ22Educi+γ23Genderi+γ24Inc.Demi+ν0i (4.3)
Frailty terms
Wi(t)=R0ν0i;Wi(t)=R1ν1i;Wi(t)=R2ν2iWi(t)=R0ν0i+R1ν1iWi(t)=R0ν0i+R2ν2iWi(t)=R2ν2i+R3ν3iWi(t)=R0ν0i+R1ν1i+R2ν2i