如何使用R计算与具有相同字符的另一列对应的一列的第90个百分位数

Question

df<-read. csv("input. csv") 
df
So my dataframe df looks like this... 
Name              Time
Launch              10
Launch              20
Launch              30
Login                 55
Login                 69     
Login                 48
Login                 74
Logout              29
Logout              13

Basically what I want is to add another column to my dataframe and it should hold 90th percentile of column"Time" wrt column "Name"

My expected output should look like..

Name              90thpercentile-_Time
Launch              90thpercentile(10,20,30)
Login                 90thpercentile(55,69,48,74)
Logout              90thpercentile(29,13)

I tried a lot using R by using functions like quantile, aggregate but I did not get the expected result. Could someone help please???

Answer 1

aggregate(df$Time, by=list(Name=df$Name), FUN=function(x) quantile(x, probs =0.9))