10.0 



5.0 



1.0 



0.5 



0.1 

 0.05 



0.01 



0.005 



0.0005 























FROM FILTERED DATA WITH FILTER 

 r = 0.05 

 h = 0.01 

 N - 70 







































































































































































































































































































































1 















1 















1 















I 















1 















1 















1>/U 















— \r+— 









r \ 







V 









\ 















\ 













^ 



20 30 to 50 60 



FREQUENCE, CYCLES PER WEEK 



TO 



Figure 11. Spectral density function (variance per unit 

 band) versus frequency. The graph was obtained from the 

 data used in plotting figure Xk after filtering. The 

 l^f- cycle -per-veek component has been practically elim- 

 inated leaving the 7-cycle per week component unchanged 

 in shape and magnitude. 



26 



