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## File Name: dmlavaan_se_sandwich.R
## File Version: 0.115
dmlavaan_se_sandwich <- function(mod1, mod2, partable, label_parnames="parnames0",
label_NPU="NPU", label_B="B", is_dmlavaan=TRUE)
{
parnames1 <- mod1[[ label_parnames ]]
NP1 <- mod1[[ label_NPU ]]
parnames2 <- mod2[[ label_parnames ]]
NP2 <- mod2[[ label_NPU ]]
#-- compute standard error for difference
scores <- cbind( mod1$scores, mod2$scores )
N <- mod1$N
A <- crossprod(scores)
if (! is_dmlavaan){
A <- A / N^4
}
B <- matrix(0, nrow=NP1+NP2, ncol=NP1+NP2)
B[ 1:NP1, 1:NP1 ] <- mod1[[ label_B ]]
B[ NP1 + 1:NP2, NP1 + 1:NP2 ] <- mod2[[ label_B ]]
parnames0 <- c( paste0(parnames1, '_mod1'), paste0(parnames2, '_mod2') )
res <- dmlavaan_sandwich_formula(A=A, B=B, parnames=parnames0)
V <- res$V
#-- now compute standard error for inference
pars_sel <- which( ! is.na( partable$diff ) )
pp <- pars_sel[1]
for (pp in pars_sel){
partable_pp <- partable[pp,]
parname_pp <- partable_pp$parname
ind_pp <- c( partable_pp$in_mod1, NP1 + partable_pp$in_mod2 )
V_pp <- V[ ind_pp, ind_pp ]
H_pp <- matrix( c(1,-1), nrow=1, ncol=2)
DV_pp <- H_pp %*% V_pp %*% t(H_pp)
partable$se_diff[pp] <- sqrt( DV_pp[1,1] )
}
partable$t <- partable$diff / partable$se_diff
partable$p <- 2*stats::pnorm(-abs(partable$t))
#--- output
res <- list(partable=partable, V=V)
return(res)
}
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