“…Similar problems surround estimation by moments and maximum likelihood (ML) for the three-parameter gamma model; s (threshold), a (scale) and p (shape). The study mainly by simulation (Bowman et al, 1987;Bowman and Shenton, 1988)used iterative techniques on the likelihood equations. No solutions would be obtained if either (a) the sample skewness was negative or (b) the iterative process for s (estimating s) reached an oscillatory cycle.…”