How do I increase x axis line width also for individual plots 1, 2 and 3, and y axis for 2, 3, 6 and 8? Thanks
mtcars %>%
rownames_to_column('car') %>%
tidyr::gather(variable, value, disp:hp, -carb, factor_key = TRUE) %>%
ggplot(aes(variable, value)) +
geom_boxplot(outlier.shape = NA, width = 0.5) +
geom_jitter(width = 0.2, size = 1, alpha = 0.7) +
facet_wrap( ~ carb) +
theme(axis.line = element_line(size = 0.5))
