.estimSummary           Obtain robust means. .
.getCondLogWeights      Log Postive-conditional weight computations for
                        wrench estimators.
.getCondWeights         Postive-conditional weight computations for
                        wrench estimators.
.getHurdle              Obtains logistic fits for presence/absence and
                        fitted probabilities of a zero occurring.
.getMargWeights         Marginal weight computations for wrench
                        estimators.
.getReference           This function generates the reference.
.gets2                  Obtain variances of logged counts.
.getWeightedMean        Get weighted means for matrix
.getWeightedMedian      Get weighted median for matrix
wrench                  Normalization for sparse, under-sampled count
                        data.
