On Sun, 24 May 2020 at 21:35, None via users <[email protected]>
wrote:
> Dear fellow fedora users,
>
> If I have a data file called 15.dat with the following content:
>
> $ cat 15.dat
> 1
> 3
> 1
> 0
> 2
>
> And I want to find min, quartile 1, median, quartile 3 and maximum (Five
> number summary)
> We can use datamash like
> $ cat 15.dat | datamash min 1 q1 1 median 1 q3 1 max 1
0 1 1.5 2.75 6
> Q3 is reported as 2.75 but if we split the data file in half the number is
> 3.
>
R makes it easy to see what is being done:
> fivenum
function (x, na.rm = TRUE)
{
xna <- is.na(x)
if (any(xna)) {
if (na.rm)
x <- x[!xna]
else return(rep.int(NA, 5))
}
x <- sort(x)
n <- length(x)
if (n == 0)
rep.int(NA, 5)
else {
n4 <- floor((n + 3)/2)/2
d <- c(1, n4, (n + 1)/2, n + 1 - n4, n)
0.5 * (x[floor(d)] + x[ceiling(d)])
}
}
--
George N. White III
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