Ntkl | R Documentation |
This function computes the N_{tkl} value which is required in the computation of the exact and asymptotic variance
of Cuzick and Edwards T_{comb} test, which is a linear combination of some T_k tests.
N_{tkl} is defined on page 80 of (\insertCitecuzick:1990;textualnnspat) as follows.
Let a_{ij}(k) be 1 if j is a k
NN of i and zero otherwise and
N_t(k,l) = ∑ ∑_{i \ne m}∑ a_{ij}(k) a_{mj}(l).
The logical argument nonzero.mat
(default=TRUE
) is for using the A matrix if FALSE
or just the matrix of nonzero
locations in the A matrix (if TRUE
) in the computations.
See (\insertCitecuzick:1990;textualnnspat) for more details.
Ntkl(dat, k, l, nonzero.mat = TRUE, ...)
dat |
The data set in one or higher dimensions, each row corresponds to a data point. |
k, l |
Integers specifying the number of NNs (of subjects i and m in a_{ij}(k) a_{mj}(l)). |
nonzero.mat |
A logical argument (default is |
... |
are for further arguments, such as |
Returns the N_{tkl} value. See the description.
Elvan Ceyhan
asycovTkTl
, and covTkTl
n<-20 #or try sample(1:20,1) Y<-matrix(runif(3*n),ncol=3) k<-1 #try also 2,3 or sample(1:5,1) l<-1 #try also 2,3 or sample(1:5,1) c(k,l) Ntkl(Y,k,l) Ntkl(Y,k,l,nonzero.mat = FALSE) Ntkl(Y,k,l,method="max")
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