How to group a unique column and find the mean value in a separate column in R

Question

My table of data looks like this image (but with many more lines):

I want to be able to find the mean age of each region, so the mean age for region SSC20790 and so on. I believe I can use the dplyr package?

Answer 1

Something like this for instance:

library(plyr)
ddply(data,'region',function(x) {mean(x$age)})

Answer 2

Yes, the dplyr package can be used to calculate that:

mean_by_region <- your_data %>%
  group_by(region) %>%
  mutate(mean_age=mean(age,na.rm=T)) %>%
  data.frame()