cum3 {boot}  R Documentation 
Calculates an estimate of the third cumulant, or skewness, of a vector. Also, if more than one vector is specified, a productmoment of order 3 is estimated.
cum3(a, b=a, c=a, unbiased=TRUE)
a 
A vector of observations. 
b 
Another vector of observations, if not supplied it is set to the value of a .
If supplied then it must be the same length as a .

c 
Another vector of observations, if not supplied it is set to the value of a .
If supplied then it must be the same length as a .

unbiased 
A logical value indicating whether the unbiased estimator should be used. 
The unbiased estimator uses a multiplier of n/((n1)*(n2))
where n
is
the sample size, if unbiased
is FALSE
then a multiplier of 1/n
is used.
This is multiplied by sum((amean(a))*(bmean(b))*(cmean(c)))
to give the
required estimate.
The required estimate.