Count the number of occurances of values in ggplot

Question

I have the following data:

df = data.frame(c("2012","2012","2012","2013"), c("tuesday","tuesday","friday","thursday"), c("AAA","BBB","AAA","AAA")) colnames(df) = c("year","day","type")

I want to show the number of occurances (absolute frequency) of type values (AAA, BBB) per year and day. Currently I wrote the following code, but it requires that I add one more dimension to aes, e.g. aes(type, some_dimension, fill = as.factor(year)). So, how can I add something like count(type)?

ggplot(dat) + geom_bar(aes(type, fill = as.factor(year)), position = "dodge", stat = "identity") + facet_wrap(~day)

Marta · Accepted Answer · 2016-10-20 09:32:45Z

5

In geom_bar change stat from "identity" to "count", like here:

library("ggplot2") ggplot(df) + geom_bar(aes(x = type, fill = as.factor(year)), position = "dodge", stat = "count") + facet_wrap(~day)

answered Oct 20, 2016 at 9:32

Marta

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2 Comments

FiofanS Over a year ago

Thanks. I get the error Error: stat_count() must not be used with a y aesthetic. on my real data. What does it mean and how to tackle it?

Marta Over a year ago

You probably added y to aes part (maybe not exactly, but as a second argument). Could you show your data and code? It would be easier then.

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