PART IV: ENERGY ATTENUATION FACTOR 

 Analytical Procedures 



26. Two FORTRAN computer programs provided the principal tools for 

 analysis of the data measured at Kodiak: "Statistical Package for the Social 

 Sciences" (SPSS) and a program titled "WINSUM." SPSS is a comprehensive soft- 

 ware system of advanced statistical routines, originally developed by the 

 National Opinion Research Center of the University of Chicago. SPSS statisti- 

 cal routines are highly versatile and applicable to most scientific and engi- 

 neering data. WINSUM was developed by the Coastal Engineering Research Center 

 for analysis of periodic wind measurements. These two programs and a number 

 of supportive editing and plotting routines were executed on the WES Honeywell 

 DPS-1 system. 



27. Data from the "Summary Tables for Wind/Wave Data" and the "Summary 

 Tables for Wind Data" were first reduced to a simple listing of consecutive 

 individual readings in a predetermined FORTRAN format. Individual runs of 

 SPSS accomplished additional grouping value corrections, accounting of missing 

 values, and labeling required by particular statistical procedures. Zero val- 

 ues were included with missing values. Similarly, the NWS wind data were re- 

 duced to a simple listing of consecutive readings in a format compatible with 

 WINSUM and correlations related to the physical characteristics of the mea- 

 surement site were also accomplished. 



Wave Data Analysis 



28. The "Summary Table for Wind/Wave Data" presents the significant 

 (zero-moment) wave heights and peak periods for each sample from both wave 

 buoys. A description of how these values were computed from the original time 

 series data is provided by the ACDCP (1983a, b). The complete record was ana- 

 lyzed for the frequency distribution of wave heights in classes of 2 ft each 

 and of peak periods in classes of 2 sec each. The results of this procedure 

 are presented in Tables 12-15. 



29. Dependence of conditions measured at the inner buoy on conditions 

 measured concurrently at the outer buoy were first tested by SPSS scattergram 

 routines which included simple linear regression. These measurements were 



27 



