ggplot2 - R ggplot add new roc curve -


i want add roc curve ggplot chart, returns error code.

  library(ggplot2)   library(plotroc)    set.seed(2529)   d.ex <- rbinom(200, size = 1, prob = .5)   m1 <- rnorm(200, mean = d.ex, sd = .65)   m2 <- rnorm(200, mean = d.ex, sd = 1.5)    test <- data.frame(d = d.ex, d.str = c("healthy", "ill")[d.ex + 1],                       m1 = m1, m2 = m2, stringsasfactors = false)   plot<-ggplot(longtest, aes(d = d, m = m1 )) + geom_roc() + style_roc()   plot

its ok, if im add new roc line return error

plot<-ggplot(longtest, aes(d = d, m = m1 )) + geom_roc() + style_roc() plot+ggplot(test, aes(d = d, m = m2)) + geom_roc()

error in p + o : non-numeric argument binary operator in addition: warning message: incompatible methods ("+.gg", "ops.data.frame") "+"

how can add new line , color line different color,and add legend

melt data frame wide long format, map variable name line color within aesthetics mappings:

ggplot(melt_roc(test, "d", c("m1", "m2")),         aes(d = d, m = m, color = name)) +      geom_roc() +      style_roc()

enter image description here

you this, if want:

ggplot() +    geom_roc(aes(d = d, m = m1, color="roc1"), test) +    geom_roc(aes(d = d, m = m2, color="roc2"), test) +    scale_color_manual(values=c("roc1"="red", "roc2"="blue"),                       name="color legend", guide="legend") +    style_roc()

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