matt wrote: > hi, I need some help with this question (the answer is below but how > do u get 0.060) > > Time series Decompositionlength 48.0000 > Trend line equation yt=27.1738-5.97E-02*t > > seasonal indicies > period index > 1 4.78183 > 2 -8.07117 > 3 -10.6954 > 4 13.9847 > > > sales appera to be decreasing over time. What is the estimate of the > annual rate at which sales are decreasing? > > (The answer is) > after seasonal effects have been removed the rate of decrease is 0.060 > per quarter =0.24 ($'000) per year ie a decrease of $240 per year > > > > I cant work out how u get 0.060 and 0.24 > can someone please help > thankyou
Seems that "t" in the equation is in units of "quarter of a year". One year = 4 quarters It seems the program output expects you to know that it is using "t" as a discrete counter and not as a continuous time variable. David Jones . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
