Sample dataset:
library(ggplot2)
df = read.table(text =
"id year value1 value2 value3
1 2000 1 2000 2001
1 2001 2 NA NA
1 2002 2 2000 NA
1 2003 2 NA 2003
2 2000 1 2001 2003
2 2002 2 NA 2000
2 2003 3 2002 NA
3 2002 2 2001 NA
", sep = "", header = TRUE)
df$value1 <- as.factor(df$value1)
I know how to change color for a factor variable with three levels:
p <- ggplot(df, aes(y=id))
p <- p + scale_colour_manual(name="", values =c("yellow", "orange", "red"))
p <- p + geom_point(aes(x=year, color=value1), size=4)
p
I can also change the color for two numeric variables:
p <- ggplot(df, aes(y=id))
p <- p + scale_colour_manual(name="", values =c("value3"="grey", "value2"="black"))
p <- p + geom_point(aes(x=value3, colour ='value3'), size=3)
p <- p + geom_point(aes(x=value2, colour ='value2'), size=5)
p
But I do not know how to change the color for both in the same graph? Does it also work with scale_color_manual?
p <- last_plot() + geom_point(aes(x=year, color=value1))
p