Table 4: Distribution of UberX Driver-Partners and Taxi Drivers and Chauffeurs by Hours Worked UberX Driver- UberX Taxi Drivers and Chauffeurs partners Driver-partners (ACS) (October 2014) (October 2015) 1-15 hours/week 51% 55% 4% 16-34 30% 29% 15% 35-49 12% 10% 46% 50+ hours/week 7% 6% 35% Source: Uber and 2012-13 American Community Survey. Data for Uber driver-partners pertain to each week when they worked at least one hour in October 2014. ACS hours based on “usual hours worked per week past 12 months.” All data are for BSG surveyed market areas. Figure 9 shows that driver-partners vary the number of hours in which they use the Uber platform by a considerable amount from week to week. In any given week, well more than half (65 percent) of driver-partners drive 25 percent more, or 25 percent less, than the amount they drove in the previous week. Only 17 percent of driver-partners tend to drive within 10 percent of the amount of time that they drove in the previous week. The within-driver, across-week coefficient of variation of hours with the app turned on for drivers who were active throughout the same period is 0.35 for the 25th percentile driver, 0.54 at the median, and 0.81 for the 75th percentile driver. These figures indicate considerable variation in the amount of time drivers spend driving on the platform from week to week, and are consistent with responses to the BSG survey, which indicated that drivers valued the flexibility that driving with the Uber app provides. Figure 9: Distribution of Changes in Work Hours from Week to Week 24