axis.title =在sjPlot包的sjp.lmer（）中不起作用

Question

I'm doing some plotting of some mixed models I've been running and am pulling my hair out trying to make sjp.lmer() change the x and y axis labels of a fixed effect. If I'm missing something simple, please let me know!

This is my code:

library(sjPlot);library(lme4)

model = lmer(DV ~ IV + (1|groupingVariable), data = data, REML = F)

sjp.lmer(model, 
     type = "fe.slope", 
     vars = c("IV"),
     title = "Estimated effect of IV1 on DV", 
     geom.colors = c("black", "grey49"), 
     show.ci = T, 
     axis.title = c("IV Title", "DV Title"))

Model is a formal model estimated using glmer(). The problem is that regardless of what I write, the x and y labels do not change.

I think the syntax is correct, because this code works:

sjp.lmer(model, 
     type = "re", 
     sort.est = "sort.all", 
     facet.grid = F,
     axis.title = c("IV Title", "DV Title"))

This second being a plot of the random effects for the same model. Is this a bug? Can you for some reason not specify axis labels for fixed effect models? Thank you!

Seems like a bug. I've raised the issue on gitHub at:

https://github.com/sjPlot/devel/issues/212

Answer 1

As far as I can tell it's just an oversight ("misfeature"/bug). Looking at the code here :

reglinplot <- reglinplot +
  labs(title = title,
       x = sjmisc::get_label(model_data[[p_v]], def.value = p_v),
       y = response)

it seems the labels are hard-coded. Furthermore, the argument list of sjp.reglin ( here ) doesn't have an axis.title argument ... posting an issue, as you have done, seems like the right way forward.

However, it's not too hard to hack the plot a little bit if you know just a tiny bit about the ggplot2 package.

Set up example:

library(sjPlot); library(lme4
mod <- lmer(Reaction~Days+(Days|Subject),sleepstudy)
p1 <- sjp.lmer(mod, 
     type = "fe.slope", 
     vars = "Days")  ## stripped-down (warning about colour palette)

Hack labels:

library(ggplot2)
p1$plot.list[[1]] + labs(x="hello",y="goodbye")