I am have used STAN to create some basic models of waste flows and stocks in Bangalore. I would like to know the definition of the equations and variables and how these are calculated. I created a very basic model with 1 input flow, 1 export flow and 1 process with stock. When I pressed the calculation button it said “The math model comprises 5 equations and 8 variables”. What are these 5 equations and 8 variables how are they related to the flows and stocks in my model.
Thank you for answering my basic question.