[R-sig-ME] names of interaction / consistency between ranef and fixef

[Ben Bolker]

Can you please post this as an issue on the github repo?

On Fri, Jun 14, 2019, 8:08 PM Baud-Bovy Gabriel <baud-bovy.gabriel using hsr.it>
wrote:

> Dear all,
>
> I found that in some cases the name of the interaction for RE and FE are
> not
> consistent even if they are specified in a consistent manner. The issue
> appears
> to be a lack of consistency about when the interaction names are reordered
> alphabetically:
>
> d <- expand.grid(a=1:10, b=1:10, su=1:10)
> d$y <- with(d, rnorm(10)[su] + a*rnorm(10)[su] + b*rnorm(10)[su] +
> a*b*rnorm(10)[su])
> d$y <- d$y + rnorm(nrow(d))
>
> # no reordering
> x <- lmer(y ~ b*a + (b*a || su), d)
> names(fixef(x))     # b + a + b:a
> names(ranef(x)$su)  #  b + a + b:a
>
> # reordering only for REs
> x <- lmer(y ~ b*a + (a*b || su), d)
> names(fixef(x))     # b + a + b:a
> names(ranef(x)$su)  #  a + b + a:b  # <= ro
>
> # consistent alphabetical reordering
> x <- lmer(y ~ a + b + b:a + (a + b + b:a || su), d)
> names(fixef(x))     # a b a:b
> names(ranef(x)$su)  # a b a:b
>
> # reordering only for FEs
> x <- lmer(y ~ a +  b + b:a + (a + 0 | su) + (b + 0 | su) + (b:a + 0 |
> su), d)
> names(fixef(x) )   # b + a + a:b
> names(ranef(x)$su) # a + b + b:a
>
> # warning messageabout missing slope when interaction names are not
> consistent
> insight::get_variance(x)
>
> I found the issue when using performance::r2, which calls
> insight::get_variance(x) and checks
> for consistency between names of RE and FE.  I am not sure if it is a bug.
>
> Best,
>
> Gabriel
>
> --
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