covTcomb  R Documentation 
Tcomb
This function computes the covariance matrix for the T_k values used in the T_{comb} test statistics, which is a linear combination of some T_k tests.
The argument, n_1, is the number of cases (denoted as n1
as an argument).
The number of cases is denoted as n_1 to match the casecontrol class labeling,
which is just the reverse of the labeling in \insertCitecuzick:1990;textualnnspat.
The argument klist
is the vector
of integers specifying the indices of the T_k values used
in obtaining the T_{comb}.
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.
The logical argument asy.cov
(default=FALSE
) is for using the asymptotic covariance or the exact (i.e. finite
sample) covariance for the vector of T_k values used in Tcomb
.
If asy.cov=TRUE
, the asymptotic covariance is used, otherwise the exact covariance is used.
See page 87 of (\insertCitecuzick:1990;textualnnspat) for more details.
covTcomb(dat, n1, klist, nonzero.mat = TRUE, asy.cov = FALSE, ...)
dat 
The data set in one or higher dimensions, each row corresponds to a data point. 
n1 
Number of cases 
klist 

nonzero.mat 
A logical argument (default is 
asy.cov 
A logical argument (default is 
... 
are for further arguments, such as 
Returns the covariance matrix for the T_k values used in Tcomb
.
Elvan Ceyhan
asycovTkTl
, covTcomb
, and Ntkl
n<20 #or try sample(1:20,1) Y<matrix(runif(3*n),ncol=3) cls<sample(0:1,n,replace = TRUE) #or try cls<rep(0:1,c(10,10)) n1<sum(cls==1) kl<sample(1:5,3) #try also sample(1:5,2) kl covTcomb(Y,n1,kl) covTcomb(Y,n1,kl,method="max") covTcomb(Y,n1,kl,nonzero.mat = FALSE) covTcomb(Y,n1,kl,asy=TRUE)
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