Sample parameter estimates 



The spectral estimates that resulted from this sequence of 

 operations were then processed further to obtain some additional 

 useful information. Let U, *, for h = 0, 1, 2, • • • , 60, represent the 

 spectral estimates (after subtraction of the noise and multiplication by 

 the calibration for the shipborne recorder) in terms of the resolution 

 of the variance of the wave record into frequency intervals. The 

 following quantities were then also computed and tabulated with each 

 spectrum. 



(2) CORR VAR = corrected variance = SU * 



(3) SIG HGT = Hi = 2.83(2SU *)^^^ 



3 n 



~ 1/2 



(4) AVER T = T = [SUj^*/2f^^Uj^*] 



(5) TOTAL DF= Total degrees of freedom = 10 [S U^*]^/ [S U^^^] 



(for 600 points, 60 lags; i. e. , 20 degrees of freedom 

 per spectral estimate) 



The confidence intervals on the corrected variance and on the 

 significant height are given by 



(6) 



and by 



+1 /n/tdF 

 Upper 95% on CORR VAR = (10 ^'^ ^^-^ ) CORR VAR 



Lower 5% on CORR VAR =(10"^^'^'^^-^ ) CORR VAR 



