Message-ID: <6a690593-a93f-588f-588e-a9f481e523cb@hsr.it>
Date: 2019-06-14T10:08:30Z
From: Baud-Bovy Gabriel
Subject: names of interaction / consistency between ranef and fixef
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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Gabriel Baud-Bovy tel.: (+39) 348 172 4045 (mobile)
UHSR University (+39) 02 2643 3429 (laboratory)
via Olgettina, 58 (+39) 02 9175 1540 (secretary)
20132 Milan, Italy email: gabriel.baud-bovy at hsr.it
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