“…Stochastic compar tment analysis has undergone rapid development for several years , and might be categorized as follows . First , many papers have emphasized the mathematical formulation and exploration of the stochastic behavior of a variety of compartment models; papers of this type are exemplified by Bright (1973) , Matis (1972Matis ( , 1974Matis ( , 1975aMatis ( , 1975b , Marcus (1975), Hartley (1972), Purdue (l974a , l974b , 1975) , Rescigno (1973) , Rubinow and Winzer (1971) 'S…”