ILLUSTRATIONS 



1 Geographical location of oceanographic stations. . . page 9 



2 Sea-surface temperatures as a function of time for 



selected years of data. . . 10 



3 Autocorrelation coefficients for residual time series. . . 14 



4 Histograms of the frequency of missing temperature 



sequences. ..17 



5 Histograms of differences between regression coefficients 



of sample time series and complete time series. 

 Scripps Pier. . . 21 



6 Histograms of differences between regression coefficients 



of sample time series and complete time series. 

 Triple Island. . . 22 



7 Plot of regression coefficients j8 versus $ for sample 



time series. Scripps Pier, 0.5 data missing. .. 23 



8 Fractional increase in variance of regression coefficients 



due to random missing data. . .25 



9 Fractional increase in variance of regression coefficients 



due to nonrandom missing data. . . 23 

 10 Increase in variance of autocorrelation coefficients due to 

 random and nonrandom missing data. . . 3 



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