From Markov Chains to Compartmental Models
Gilbert G. Walter, Martha Contreras · Modeling and simulation in science, engineering & technology · 1999
For our Markov chain models, we have always assumed that the state vectors are probabilities. However, in some applications such as ecosystems, we are more interested in the quantities of, say, a nutrient in a particular state at a particular time rather than the probability that a molecule is in that state at that time. We shall see that the two concepts are equivalent.