spss='BrandsAB1file.sav';

model  choice 1 /
  toler=1e-008  tolem=0.01  bayes=1  bayess2=1  bayeslat=1
  bayespoi=1
  iterem=250  iternr=50  itersv=50
  iterboot=500
  homs2=no
  usemiss=No
  sewald=yes
  resid
;
chdes = 1;
dependent SELECTED;
replicate CASE_ID;
chidv SET_ID;
chvar BRAND PRICE NOBUY;
chnom ALT_ID BRAND PRICE _Constants_;
chnum CASE_ID INCOME SET_ID NOBUY SELECTED 'PRICE.A' 'PRICE.B';
descendch PRICE;
covariate INCOME;
attr INCOME nominal ;
end;