I am learning analysis of longitudinal data from the book
Longitudinal data Data Analysis for the Behavioral Science using R by Jeffrey
Long.
On page 123,
myX <- scale_x_continuous(breaks = 5:8, name = "Grade")
myY <- scale_y_continuous(name = " Reading Score ")
g1 <- ggplot(data=MPLS.LS, aes(x=grade, y=read)) + geom_point(shape =1) + myX
+myY
g2 <- g1 + stat_summary(fun.y = mean, geom = "line", lwd = 1.5, linetype = 5)
print(g2)
It refused to draw the curve of the means, with an error message:
geom_path: Each group consist of only one observation. Do you need to adjust
the group aesthetic?
But it doesn't give the error message if I used instead
g3 <- g1 + stat_summary(fun.y = mean, geom = "point", size=3, shape = 19)
print(g3)
Any advice would be greatly appreciated.
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