Suppose I want to calculate the proportion of different values within each group. For example, using the mtcars data, how do I calculate the relative frequency of number of gears by am (automatic/manual) in one go with dplyr? library(dplyr) data(mtcars) mtcars <- tbl_df(mtcars) # count frequency mtcars %>% group_by(am, gear) %>% summarise(n = n()) # … Read more
I need to find the frequency of elements in an unordered list a = [1,1,1,1,2,2,2,2,3,3,4,5,5] output-> b = [4,4,2,1,2] Also I want to remove the duplicates from a a = [1,2,3,4,5] 34 Answers 34 In Python 2.7 (or newer), you can use collections.Counter: import collections a = [1,1,1,1,2,2,2,2,3,3,4,5,5] counter=collections.Counter(a) print(counter) # Counter({1: 4, 2: 4, … Read more
I have a dataset category cat a cat b cat a I’d like to be able to return something like (showing unique values and frequency) category freq cat a 2 cat b 1 15 Answers 15
