The power, food, and lumber provided by Oregon helped fuel the development of the West, although the periodic fluctuations in the nation's building industry have hurt the state's economy on multiple occasions.
12.
One characteristic of the SMA is that if the data have a periodic fluctuation, then applying an SMA of that period will eliminate that variation ( the average always containing one complete cycle ).
13.
Hydroelectric power, food, and lumber provided by Oregon helped fuel the development of the West, although the periodic fluctuations in the U . S . building industry have hurt the state's economy on multiple occasions.
14.
Thus the new TDB, like T eph, is essentially a more refined continuation of the older ephemeris time ET and ( apart from the periodic fluctuations ) has the same mean rate as that established for ET in the 1950s.
