percentile_ratio
is percentile / 100
,
e.g. the 90-th percentile corresponds to a percentile_ratio
of 0.9
.
ddof
stands for delta degress of freedom, and the sum of squares will be
divided by count - ddof
, where count
is the number of elements
for population standard deviation, set ddof
to 0
for sample standard deviation, set ddof
to 1
ddof
stands for delta degress of freedom, and the sum of squares will be
divided by count - ddof
, where count
is the number of elements
for population variance, set ddof
to 0
for sample variance, set ddof
to 1