LinearCorrectedVariance
                        Estimates variance of a transformation of
                        latent Poisson means
Poisson_Corrected_PCA   PCA with Poisson measurement error
get_scores              Calculates principal scores for Poisson-noise
                        corrected PCA
make_compositional_variance
                        Converts a covariance matrix to compositional
                        form
makelogtransformation   constructs a log transformation for use with
                        functions from the PoissoncorrectedPCA package.
polynomial_transformation
                        constructs a polynomial transformation for use
                        with functions from the PoissoncorrectedPCA
                        package.
