*
* Example 4.2.2 on page 127. (Graphs are figures 4-9 to 4-11).
*
cal 1770
open data sunspots.dat
data 1770:1 1869:1 spots
stats spots
*
* @BDSpectrum is a simplified version of the RATS procedure @Spectrum. It has
* only the HEADER and FOOTER (for the graph), WIDTH (for flat smoothing of the
* periodogram) and WEIGHTS (for weighted smoothing).
*
@BDSpectrum(footer="Figure 4-9 Periodogram") spots
@BDSpectrum(footer="Figure 4-10 Lightly smoothed estimate",width=1) spots
@BDSpectrum(footer="Figure 4-11 Double smoothed estimate",weights=||3.0,3.0,2.0,1.0||) spots