[R-sig-ME] Multi-level Rasch Model Per Douglas Bates' paper

[Ben Bolker]

    Apologies for not looking this over in great detail, but not sure 
why you're mixing lme4 and glmmTMB here??  Isn't item easiness just 
lme4::coef(fm2)$item ?

easiness <-
   lme4::ranef(fm2)$item[[1]] +
   glmmTMB::fixef(fm2)[imap$itype])

On 5/13/20 1:25 PM, Rasmus Liland wrote:
> On 2020-05-13 18:50 +0200, Rasmus Liland wrote:
>> Indeed it does work now!  Thanks!
> Right, so this code reproduces code until the
> easiness variable on page 15.  Perhaps this
> is useful?
>
> data("lq2002", package="multilevel")
> wrk <- lq2002
> # wrk[1:5,]
> for (i in 3:16) wrk[[i]] <- ordered(wrk[[i]])
> for (i in 17:21) wrk[[i]] <- ordered(5 - wrk[[i]])
> lql <- reshape(wrk,
>    varying = list(names(lq2002)[3:21]),
>    v.names = "fivelev",
>    idvar = "subj",
>    timevar = "item",
>    drop = names(lq2002)[c(2, 22:27)],
>    direction = "long")
> lql$itype <-
>    with(lql, factor(ifelse(item < 12, "Leadership",
>      ifelse(item < 15, "Task Sig.", "Hostility")
>    )))
> for (i in c(1, 2, 4, 5)) lql[[i]] <- factor(lql[[i]])
> lql$dichot <- factor(ifelse(lql$fivelev < 4, 0, 1))
> # str(lql)
> # summary(lql)
>
> ## 3.2 Fitting an initial multilevel Rasch model
> (fm1 <- lme4::glmer(
>    dichot ~ 0 + itype + (1 | subj) +
>      (1 | COMPID) +
>      (1 | item),
>    lql,
>    binomial))
> rr <- lme4::ranef(fm1, condVar = TRUE)
> str(rr$COMPID)
> head(rr$COMPID)
>
> qq <- lattice::qqmath(rr)
> print(qq$subj)
>
> ## 3.3 Allowing for interactions of company and item type
> (fm2 <- lme4::glmer(
>    dichot ~ 0 + itype + (1 | subj) +
>      (0 + itype | COMPID) +
>      (1 | item),
>    lql,
>    binomial))
>
> (fm3 <- lme4::glmer(
>    dichot ~ 0 + itype + (1 | subj) +
>      (1 | COMPID:itype) +
>      (1 | item),
>    lql,
>    binomial))
>
> (fm3a <- lme4::glmer(
>    dichot ~ 0 + itype + (1 | subj) +
>      (1 | COMPID:itype) +
>      (1 | COMPID) +
>      (1 | item),
>    lql,
>    binomial))
>
> anova(fm3, fm3a, fm2)
>
> str(imap <- unique(lql[, c("itype", "item")]))
>
> (easiness <-
>    lme4::ranef(fm2)$item[[1]] +
>    glmmTMB::fixef(fm2)[imap$itype])
>
> Best,
> Rasmus
>
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