eg_data <- as.data.frame(list(no = c(1, 2, 3, 4),
mark_at_1 = c(12, 7, 23, 45), gender = c("M", "F", "M", "F"),
mark_at_2 = c(12, 34, 89, 45), trialarm = c("1","1","2","2")))
plot_meanSE_longitudinal_twogroups(eg_data, c("mark_at_1", "mark_at_2"),
c("1","2"), "mark")
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