Nt.def {nnspat} | R Documentation |
Value (found with the definition formula)
Description
This function computes the value which is required in the computation of the asymptotic variance
of Cuzick and Edwards
test. Nt is defined on page 78 of (Cuzick and Edwards (1990)) as follows.
(i.e, number of triplets
, and
distinct so that
is among
NNs of
and
is among
NNs of
).
This function yields the same result as the asyvarTk
and varTk
functions with $Nt
inserted at the
end.
See (Cuzick and Edwards (1990)) for more details.
Usage
Nt.def(a)
Arguments
a |
The |
Value
Returns the value standing for the number of triplets
, and
distinct so that
is among
NNs of
and
is among
NNs of
. See the description.
Author(s)
Elvan Ceyhan
References
Cuzick J, Edwards R (1990). “Spatial clustering for inhomogeneous populations (with discussion).” Journal of the Royal Statistical Society, Series B, 52, 73-104.
See Also
Examples
n<-20 #or try sample(1:20,1)
Y<-matrix(runif(3*n),ncol=3)
k<-2 #try also 2,3
a<-aij.mat(Y,k)
Nt.def(a)