was found later to be closely related to the AR—model fitting technique discussed in Sec- 
tion 5.5. 
13. In the analysis of seakeeping data, multiple input analysis is helpful. Partial co- 
herencies and the multiple coherency give a good clue to the extent of contributions from 
each input. 
14. In connection with consideration of the filtration of the stochastic process, the 
model fitting techniques that try to express the stochastic process by a finite number of 
parameters are found to look promising to supplement the nonparametric method. The 
model fitting technique or parametric method will be reviewed in detail in Part I. 
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