...the process to be in a particular state of ' statistical equilibrium' (Box and Jenkins (1976, page 26)). A stochastic process is said to be strictly...joint probability distribution at any set of times f,,/,, ...,/m must be the same as the joint probability distribution at times tl + k,t2 + k,...,tm+k,...

...process, is based on the assumption that the process is in a particular state of statistical equilibrium. A stochastic process is said to be strictly stationary...properties are unaffected by a change of time origin; that is, if the joint probability distribution associated with m observations z,i, 2,2 ... Zm,, made...