TABLE 2 - Stratified Ratio Sampling Statistics

TABLE 2 - Stratified Ratio Sampling Statistics

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  Stratum
1 2 3 4 All
Stratum weight 37% 31% 31% 2% 100%
Mean passenger-miles per trip 41 123 237 197 129
cv of passenger-miles 0.68 0.63 0.62 0.45  
Mean of boardings per trip 15 39 30 19 27
cv of boardings 0.56 0.71 0.54 0.46  
Ratio of passenger-miles to boardings (average passenger trip length) 2.81 3.21 7.78 10.54  
Boardings to passenger-miles correlation coefficient 0.89 0.88 0.79 0.79  
Unit cv of the ratio 0.31 0.34 0.38 0.3  
Contribution to the sum in equation (21) (relative contribution to variance of the systemwide estimate) 60 549 2,479 57 3,144