v/by(a) 
v/ay(a) 
CONFIDENCE BAND OF ,?-DIST. 
95% 
90% 
80% 
5 (1-2) 
Ay () by (a) 
DEG. OF FREEDOM v 
eS 
Fig. 2.17. Confidence band by y*-distribution. 
This interval is shown in Fig. 2.19 at a confidence level of 90% (c = 1.64) as an 
example, with values of the y*—distribution at the 90% level. Asv increases, the confi- 
dence band shows almost the same level as the one from the y7—distribution. 
3. Expressions of Precision of the Spectrum Estimation 
There are several ways to express the measure of precision of the spectral estimates, 
and they are related to each other as shown in Priestly.” 
38 
