mom2cum | R Documentation |
The function compute a simple or a multivariate moment in terms of simple or multivariate cumulants.
mom2cum(n = 1)
n |
integer or vector of integers |
Faa di Bruno's formula (the MFB
function) gives the coefficients of the exponential formal
power series f[g()]
where f
and g
are exponential formal power series too. Simple moments
are expressed in terms of simple cumulants using the Faa di Bruno's formula obtained from the MFB
function
in the case "composition of univariate f
with univariate g
" with f[i]=1, g[i]=k[i]
for each i
from 1 to n
and k[i]
cumulants. Multivariate moments are expressed in terms
of multivariate cumulants using the Faa di Bruno's formula obtained from the MFB
function in
the case "composition of univariate f
with multivariate g
". In such a case the coefficients of
g
are the multivariate cumulants.
string |
the expression of the moment in terms of cumulants |
The value of the first parameter is the same as the MFB
function in the univariate with
univariate case composition and in the univariate with multivariate case composition.
This function calls the MFB
function in the kStatistics
package.
Elvira Di Nardo elvira.dinardo@unito.it,
Giuseppe Guarino giuseppe.guarino@rete.basilicata.it
E. Di Nardo, G. Guarino, D. Senato (2008) An unifying framework for k-statistics, polykays and their generalizations. Bernoulli. 14(2), 440-468. (download from https://arxiv.org/pdf/math/0607623.pdf)
E. Di Nardo E., G. Guarino, D. Senato (2011) A new algorithm for computing the multivariate Faa di Bruno's formula. Appl. Math. Comp. 217, 6286-6295. (download from https://arxiv.org/abs/1012.6008)
P. McCullagh, J. Kolassa (2009) Scholarpedia, 4(3):4699. http://www.scholarpedia.org/article/Cumulants
MFB
# Return the simple moment m[5] in terms of the simple cumulants k[1],...,k[5]. mom2cum(5) # Return the multivariate moment m[3,1] in terms of the multivariate cumulants k[i,j] for # i=0,1,2,3 and j=0,1. mom2cum(c(3,1))
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