Did you read the help page?
x: numeric vector whose sample quantiles are wanted. ‘NA’ and
‘NaN’ values are not allowed unless ‘na.rm’ is ‘TRUE’.
so only 'numeric' vectors are really supported, although it does say
The default method does not allow factors, but works with
Full_Name: Hong Ooi
Version: 2.10.0
OS: Windows XP
Submission from: (NULL) (203.110.235.1)
While trying to get summary statistics on a duration variable (the difference
between a start and end date), I ran into the following issue. Using summary or
quantile (which summary calls) on a difftime obj
