In R, calculate % of rows that are true

Question

How to calculate % of rows that are true in a data set? See example data frame and output below dataframe

ID Present
1  True
2  True
3  True
4  False 
5  False 

example output 1

60%

example output 2

.60

Answer 1

Using base R you could do:

mean(as.logical(df$Present))
[1] 0.6

You can multiply that by 100

prop.table(table(df$Present))

or even:

mosaic::tally(~Present, df, format = 'proportion')
Present
False  True 
  0.4   0.6 

mosaic::tally(~Present, df, format = 'percent')
Present
False  True 
   40    60