Changes in version 1.2-0 (2017-06-18)                  

    o   Added MAPE function.

    o   Added parameters trimLo and trimUp to MSPE function.

                 Changes in version 1.1-1 (2017-01-20)                  

    o   Fixed a small bug in function f and corresponding example.

                 Changes in version 1.1-0 (2016-11-17)                  

    o   Added function acfARp to compute autocovariances of AR(p) processes.

    o   Added function f that can be used to verify assumption (10) from
	Theorem 3.1 in Kley et al. (2016).

                 Changes in version 1.0-0 (2016-11-12)                  

    o   two functions to compute linear prediction coefficients and mean squared
	prediction errors.

    o   demo on how to analyse, using a simulated tvARMA(1,1) time series