2010 58 1 3–23 c �2010 20 † 2009 8 28 12 16 2010 2 10 12 95 50 13 1. 1 17 12 48 Särndal, 2005 Groves et al., 2002 † 464–8601 4 58 1 2010 Covariate 3 Taylor et al., 2001; , 2007; Schonlau et al., 2009 , 2009, 5 6 3 Heckman Heckman, 1974 Heckman , 2009 Ishwaran and James, 2001 12 2 3 5 4 Blocked Gibbs sampler 5 12 2. N N1 N2(= N − N1) y z = 1 z = 0 z x 1 z = 1 y z = 0 y y E(y) Ê(y) = 1 N N � i=1 y