A vector of t-statistics, i.e. the output of getdF.
n
The number of t-statistics.
data
The data used to compute t-statistics, either a matrix
or an ExpressionSet.
categ
A vector of 0's and 1's indicating group membership.
ng1
The number of samples in group 1.
ng2
The number of samples in group 2.
Value
The different functions have different return values, but generally
they are vectors of the requested quantities.
Details
The functions getdF compute t-test statistics
for the input data and group membership (note that group membership
must be indicated by a vector of 0's and 1's).
The function dstar computes an unbiased estimate of the t-test.
The function sigmad computes the variance estimate of
dstar.
References
Choi et al, Combining multiple microarray studies and
modeling interstudy variation. Bioinformatics, 2003, i84-i90.