#activate the package
library(ggplot2)

#load the dataframe
ID <- 1:200
values <- rnorm(200, mean=65, sd=15)
my.dataframe <- data.frame(ID, values)


#simple frequency polygon with ggplot()
ggplot(my.dataframe, aes(values)) + 
  geom_freqpoly()

#simple histogram with ggplot()
ggplot(my.dataframe, aes(values)) + 
  geom_histogram()

#same frequency polygon but with 60 bins
ggplot(my.dataframe, aes(values)) + 
  geom_freqpoly(bins= 60)

#same frequency polygon but with binwidth=10       
ggplot(my.dataframe, aes(values)) + 
  geom_freqpoly(binwidth= 10)              

#same frequency polygon but different look
ggplot(my.dataframe, aes(values)) + 
  geom_freqpoly(bins= 60, size = 1.5, color = "darkblue", linetype="dotted")