Dataset:  port_taiwan.csv

Source: W-Y. Peng, C-W. Chu (2009). "A Comparison of Univariate Methods for
Forecasting Container Throughput Volumes," Mathematical and Computer
Modelling, Vol. 50, pp. 1045-1057.

Description: Monthly container throughput at at 3 Taiwan ports (TEUs = Twenty foot
equivalent units) for 1/2003-12/2006. Model fit as trigonometric Regression:

Y = b0 + b1*t + b2*sin(2*pi*t/12) + b3*t*sin(2*pi*t/12) + b4*cos(2*pi*t/12)
  + b5*t*cos(2*pi*t/12) + b6*sin(4*pi*t/12) + b7*t*sin(4*pi*t/12) +
    b8*cos(4*pi*t/12) + b9*t*cos(4*pi*t/12) + e

Variables/Labels
port     /* 1=Keelung, 2=Taichung, 3=Kaoshiung  */
year
month of year  (month)
container throughput in TEUs   (throuput)
throuput/1000   (y)
series month from 1-48   (t)
sin(2*pi*t/12) ... t*cos(4*pi*t/12)    (X2 ... X9)