Axel, I really think that this need would probably be too specific to be including in as general a library as MASON. Sean On Aug 8, 2015, at 4:12 PM, Axel Kowald <[log in to unmask]> wrote: > Hi Everybody, > > this time I have a suggestion for a new feature for MASON and I wonder > if others would also find it useful. > > The point is that I find myself often with the problem to run a > simulation until one or all of my agent types have reached a steady > state. Basically I keep track of the number of my agents with a variable > and then plot this variable while the simulation is running. I simply > watch this plot and stop it manually whenever I have the feeling that a > steady state is reached. > > But this seems to be a very non-reproducible and cumbersome way of doing it. > Maybe this would be a job for the Schedule class of MASON ? > If we are only interested in the total number of all agents Schedule has > in principle all the information it needs (number of agents at each time > step). Of course if there are different agent types and the all should > reach equilibrium things might become more complicated. I'm not sure > what the best way is to test if a variable that is subject to random > fluctuations has reached a steady state. Some ideas would be > > (1) take the last N values, calculate a linear regression line and > compute the p-value that the slope is different from zero. > (2) to avoid the arbitrary choice of N, one could also start with the > last 2 points and calculate the p-value. If it is below a given > threshold stop, if not repeat the calculation with the last 3 points, > etc. until a p-value below the threshold is found or until all available > points are used. This seems computationally very expensive, but it was > just an idea. > > Any comments? > > Axel >