trend

trend(input, averageTime, initialTrend) is the system dynamics function that returns the average fractional growth rate (negative for decline) in the input.  

Analogous to the Vensim function trend, see the detailed description here.

trend can be called in formulas of system dynamics variables.

Example: 


Units: 

input -> units
averageTime -> time
initialTrend -> 1/time

trend() -> 1/time


Related topics

 forecast

 smooth