Data presentation in ggplot2

Question

Hi, I’m having trouble at ggplot2 on a histogram.

The code:

ggplot(data.combined[1:891,], aes(x = Age, fill=Survived)) + 
  facet_wrap(~Sex + Pclass) + 
  geom_histogram(binwidth = 10) + 
  xlab ("Age") + 
  ylab ("Total Count")

With the following code, using exactly the same data of a tutorial I’m getting a histogram in which the value of 0 (initial) is in the middle of the first box, already in the tutorial the subject box starts at zero.

Can someone help me with this? I am worried because along the difference between one being in the beginning and the other in the middle I get distortions in reading the information on my chart, harming the interpretation.

How should I get:

How do I get:

Thank you very much!

Answer 1

Apparently you just need to wear boundary = 0 in the geom_histogram to force the first bar to 0. Since you did not provide the data, I created an example, it was a little different but seems to have solved:

data.combined <- data.frame(Age = rnorm(891, 35, 10),
                            Survived = sample(c(TRUE, FALSE), 891, TRUE),
                            Sex = sample(c("male", "female"), 891, TRUE),
                            Pclass = 1)

library(ggplot2)
ggplot(data.combined[1:891,], aes(x = Age, fill=Survived)) + 
  facet_wrap(~Sex + Pclass) + 
  geom_histogram(binwidth = 10, boundary = 0) + 
  xlab ("Age") + 
  ylab ("Total Count")