This function computes the mean via a call to mean. If you have
already computed the mean then you can pass it directly to
variance_m.
variance_m(
x, mean)
Estimated (sample) variance of x relative to mean:
(11.3)
sd(
x)
sd_m(
x, mean)
The standard deviation is defined as the square root of the variance of
x. These functions returns the square root of the respective
variance-functions above.
variance_with_fixed_mean(
x, mean)
Compute an unbiased estimate of the variance of x when the population
mean mean of the underlying distribution is known a priori. In
this case the estimator for the variance uses the factor
and the
sample mean
is replaced by the known population mean
: