TABLE 2 - Stratified Ratio Sampling Statistics,,,,,
,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"