Combina leyendas de color y forma en una sola leyenda

Estoy creando un diagtwig en ggplot a partir de un diseño de estudio 2 x 2 y me gustaría usar 2 colores y 2 símbolos para clasificar mis 4 combinaciones de tratamiento diferentes. Actualmente tengo 2 leyendas, una para los colores y otra para las dos formas. ¿Cómo puedo combinarlos en una sola leyenda, así que tengo un círculo azul, un círculo rojo, un triángulo azul y un triángulo de lectura?

Algunos datos:

state1 <- c(rep(c(rep("N", 7), rep("Y", 7)), 2)) year <- rep(c(2003:2009), 4) group1 <- c(rep("C", 14), rep("E", 14)) group2 <- paste(state1, group1, sep = "") beta <- c(0.16,0.15,0.08,0.08,0.18,0.48,0.14,0.19,0.00,0.00,0.04,0.08,0.27,0.03,0.11,0.12,0.09,0.09,0.10,0.19,0.16,0.00,0.11,0.07,0.08,0.09,0.19,0.10) lcl <- c(0.13,0.12,0.05,0.05,0.12,0.35,0.06,0.13,0.00,0.00,0.01,0.04,0.20,0.00,0.09,0.09,0.06,0.06,0.07,0.15,0.11,0.00,0.07,0.03,0.05,0.06,0.15,0.06) ucl <- c(0.20,0.20,0.13,0.14,0.27,0.61,0.28,0.27,0.00,1.00,0.16,0.16,0.36,0.82,0.14,0.15,0.13,0.13,0.15,0.23,0.21,0.00,0.15,0.14,0.12,0.12,0.23,0.16) data <- data.frame(state1,year,group1,group2,beta,lcl,ucl) 

Ttwig:

 library(ggplot2) pd <- position_dodge(.65) ggplot(data = data, aes(x = year, y = beta, colour = state1, group = group2, shape = group1)) + geom_point(position = pd, size = 4) + geom_errorbar(aes(ymin = lcl, ymax = ucl),colour = "black", width = 0.5, position = pd) + scale_colour_hue(name = "Treatment & State", #Legend label, use darker colors labels = c("Control", "Exclosure"), l = 40) + scale_shape(name = "State", labels = c("Non-F", "Flwr")) 

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Debe usar valores de name y labels idénticos para la escala de forma y color.

 pd <- position_dodge(.65) ggplot(data = data,aes(x= year, y = beta, colour = group2, shape = group2)) + geom_point(position = pd, size = 4) + geom_errorbar(aes(ymin = lcl, ymax = ucl), colour = "black", width = 0.5, position = pd) + scale_colour_manual(name = "Treatment & State", labels = c("Control, Non-F", "Control, Flwr", "Exclosure, Non-F", "Exclosure, Flwr"), values = c("blue", "red", "blue", "red")) + scale_shape_manual(name = "Treatment & State", labels = c("Control, Non-F", "Control, Flwr", "Exclosure, Non-F", "Exclosure, Flwr"), values = c(19, 19, 17, 17)) 

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Círculo rojo, círculo azul, triángulo rojo, triángulo azul como preguntaste:

 ggplot(data =data,aes(x= year, y = beta, shape=group2, colour=group2,group = group2)) + geom_errorbar(aes(ymin = lcl, ymax = ucl),colour = "black", width = 0.5, position = pd) + geom_point(position = pd, size = 4) + scale_colour_manual(values=c("red","blue","red","blue")) + scale_shape_manual(values=c(19,19,17,17)) + scale_fill_hue(name="Treatment & State", #Legend label, use darker colors labels=c("Control", "Exclosure"),l=40) 

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