*  Example: Newbold, Statistics for Business and Economics,  
*           Fourth Edition, 1995, Chapter 17.
SAMPLE 1 30
* Read the annual sales data (in thousands of dollars) of
* Lydia E. Pinkham from 1931 to 1960. Source: Newbold, p. 691.
READ SALES / BYVAR
 1806  1644  1814  1770  1518  1103  1266  1473  1423  1767
 2161  2336  2602  2518  2637  2177  1920  1910  1984  1787
 1689  1866  1896  1684  1633  1657  1569  1390  1387  1289
GENR YEAR=TIME(1930)
* Set the smoothing constant
GEN1 A=0.4
* Use the SMOOTH command for moving averages and exponential smoothing.
GEN1 W=1-A
SMOOTH SALES / NMA=5 WEIGHT=W MAVE=MA5 EMAVE=SS
* The results for a centered 5-point moving average (MOVING-AVE) are in
* Newbold, Table 17.12, p. 698.
* The results from exponential smoothing (EXP-MOV-AVE) are in
* Newbold, Table 17.16, p. 710.
PRINT YEAR MA5 SS
* Graph the smoothed series (see Newbold, Figure 17.7, p. 698)
SAMPLE 3 28
GRAPH MA5 YEAR / LINEONLY
STOP