suppose I have the following data which summarizes the values of a dependent variable (dv) at low and high vales of a predictor (x) and a moderator (z)
dfx <- data.frame(x = rep(c(-0.909, 0.909),2), z = c(-0.676, -0.676, 0.676, 0.676), dv = c(448.8, 464.4, 462.8, 472.1))I would like to draw the dv as a function of the predictor and the moderator by customizing **both **the type of lines and the markers
library(ggplot2)dfx$z <- as.factor(dfx$z) # turn the moderator as a factorggplot(dfx, aes(x=x, y = dv, colour=z, shape=z))+ geom_line()+ geom_point()+ scale_y_continuous("dv", limits = c(440,480))+ theme_classic()+ scale_colour_manual ("A title", values=c("black", "black"), labels=c("-1SD", "+1SD"))+ scale_shape_manual ("A title", values=c(2,15),labels=c("-1SD","+1SD"))
However, I would like to customize the linetype as well.
When I add
ggplot(dfx, aes(x=x, y = dv, colour=z, shape=z, linetype=z)
the following plot emerges. Yet I cannot either hide the second label or customize it throughscale_linetype_manual
Is there a way to fix this? I searched over the community but I could not find any method to overcome this problem. Also, when I suppress the second label, the key on it does not show both the type of line and mark.Any hint will be very much appreciated.