optBlock of the library
AlgDesign is used to search for balanced incomplete block designs
(BIBDs). The design is assigned to a matrix where rows represent blocks (subjects) and
columns represent periods.
find.BIB(trt, b, k, iter = 30)
An integer > 1 giving the number of treatments of the design.
An integer > 1 giving the number of rows (subjects) of the design.
An integer > 1 giving the number of columns (periods) of the design.
The number of iterations of the function
optBlock tries to find a D-optimal block design for the specified parameters.
The resulting design need not be a BIBD.
The necessary conditions for the existence are that bk/trt and
bk(k-1)/(trt(trt-1)) positive integers.
They are NOT checked automatically.
Even if they are fulfilled, there need not be a BIBD.
If no BIBD is found, the function is iterated.
If no BIBD is found after
iter iterations, the search is terminated.
The resulting design should be checked by the user applying
A matrix that represents the experimental design.
As indicated above, the returned design is not necessarily a BIBD design.
Wheeler, R.E. (2004). optBlock. AlgDesign. The R project for statistical computing http://www.r-project.org/
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