CODEWITHSUNDEEP
rggplot2
user2719033
user2719033

Reputation: 11

grouping variables on y-axis using geom_segment in ggplot2

I am using a segmented line plot and want to group variables on the y-axis based on a factor (in this case Patient ID). How can I change the width of the ticks on the y so that a patient is grouped by his/her ID, and only one label is given for each unique ID?

An example of my data and plot is below.

ggplot(data) +
  geom_segment(aes(x=age1, xend=age2, 
                   y=PatientID, yend=PatientID, colour=mortality)) + 
  scale_colour_manual(values=c("green", "red", "black"))

Data:

PatientID   age1     age2    mortality
11313          0        30        low
11313          31       50        low 
11313          51       65        med  
11313          0        10        med
11313          0        50        hi 
131NY          0        30        med
143CA          24       27        hi
165099         23       45        med
165099         46       55        hi 
165099         40       55        med

Upvotes: 1

Views: 1847

Answers (1)

SlowLearner
SlowLearner

Reputation: 7997

I have used the sample data provided but the output seems to be similar to the desired output as described in the question. Patients are grouped by ID and have only one label each (see 11313 below). Am I missing something?

screenshot

library(ggplot2)

mytext <- "PatientID,age1,age2,mortality
11313,0,30,low
11313,31,50,low
11313,51,65,med
131NY,0,30,med
143CA,24,27,hi
165099,23,45,med
165099,46,55,hi"

dat <- read.table(textConnection(mytext), sep = ",",
                  check.names = FALSE,
                  strip.white = TRUE,
                  header = TRUE)

ggplot(dat) +
    geom_segment(aes(x = age1, xend = age2,
                     y = PatientID, yend = PatientID, colour = mortality)) +
    scale_colour_manual(values = c("green", "red", "black"))

Upvotes: 1

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