Forecasting complexity is a measure of

complexity Complexity characterises the behaviour of a system or model whose components interaction, interact in multiple ways and follow local rules, leading to nonlinearity, randomness, collective dynamics, hierarchy, and emergence. The term is generall ...

put forward (under the original name of) by the physicist Peter Grassberger. It was later renamed "statistical complexity" by

James P. Crutchfield James P. Crutchfield (born 1955) is an American mathematician and physicist. He received his B.A. summa cum laude in physics and mathematics from the University of California, Santa Cruz, in 1979 and his Ph.D. in physics there in 1983. He is curren ...

and Karl Young.

References

Measures of complexity {{applied-math-stub