name of a directory to save histograms and QQ-plots to. If dirname=NULL, then the plots are made to the screen, and after each fit the user is asked to press a key in order to continue.
startab
start values for alpha and beta parameter
startlam
start values for mixing coefficients
tol
convergence tolerance: If the absolute likelihood ratio -1 becomes smaller than this value, then the EM algorithm is supposed to be converged.
Value
log-density matrix of same dimensions as Porig: The log-densities can be interpreted as log signal-to-noise ratios. A value > 0 means higher signal than noise, and a value < 0 a higher noise than signal.
Details
The BUM density model consists of 3 components: $f(x) = lambda_1 + lambda_2*dbeta(x,alpha,1) + lambda_3*dbeta(x,1,beta)$. The mixing coefficients and the parameters alpha and beta are fitted together via an EM algorithm.