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Specifically, 47.6% of all weekday episodes and 71% of all weekend episodes are joint. Within the class of out- of- home activities, serveâpassenger and socializing are by definition taken to be joint, and work and school activities are defined as solo. Among the remaining out- of- home activity types, eating and drinking, leisure, and religiousâcivicâvolunteer episodes are most likely to be pursued with other individuals. Finally, for every out- of- home activity type, the volume of joint episodes is higher during weekend days than weekdays. A total of 42% of weekday travel episodes and 62% of weekend travel episodes are undertaken with other persons. Again, the percentages of joint travel are higher by each mode during the weekend compared with the weekday. Finally, travel episodes undertaken as a pas- senger are by definition joint. Table 3 presents descriptives on the companion types for joint activity episodes. Specifically, it presents the percentages of joint episodes of each type that are pur- sued with only household members, with only nonhousehold members, and with both household and nonhousehold members. As in Table 2, the results are presented separately for weekdays and weekend days. Note that the numbers sum to 100% across the three columns within each of the two main columns. Further, the activity types that are solo by definition are not included. On examining the joint in- home episodes, we find that the companions are predominantly household mem- bers. The percentage of episodes undertaken with only household members decreases from weekdays to week- end days, whereas the percentage of episodes undertaken with only nonhousehold members and with both house- hold and nonhousehold members increases from week- days and weekend days. Overall, this indicates that nonhousehold members are more likely to be compan- ions for in- home activities during weekend days. Within the class of in- home activity types, socializing and mis- cellaneous episodes are most likely to include nonhousehold companions. The results for out- of- home episodes indicate that joint episodes are most likely to be pursued solely with nonhousehold members, especially during weekdays. The percentage of episodes pursued with both household and nonhousehold members is higher during the week- end than the weekday. Finally, we also observe that about 45% of weekday and 56.5% of weekend joint episodes include household members. This suggests that, unlike for in- home episodes, household members are more likely to be companions for out- of- home joint episodes during the weekends. Within the class of out- of- home activity types, shopping episodes are most likely to be pursued with only household members. On the other hand, socializing, leisure, and eating and drinking are more likely to be undertaken with nonhousehold companions. Finally, results from Table 3 also indicate that about 60% of all joint travel is undertaken with only house- 132 INNOVATIONS IN TRAVEL DEMAND MODELING, VOLUME 2 TABLE 3 Descriptives on Companion Type for Joint Episodes by Activity Type and Day of the Week Weekday Weekend Only HH Only non-HH Both Only HH Only non-HH Both In-home activities Household chores 85.98 9.23 4.79 83.61 9.97 6.42 Caregiving 96.86 0.19 2.95 95.19 0.28 4.53 Eating and drinking 87.81 5.75 6.44 83.60 6.15 10.26 Socializing 55.66 26.12 18.22 40.23 28.98 30.80 Television and music 89.46 6.80 3.74 86.64 7.57 5.79 Other leisure 88.21 8.47 3.31 86.10 8.99 4.91 Miscellaneous 48.11 39.59 12.30 49.49 33.97 16.54 Overall (in home) 85.91 8.42 5.67 81.76 9.36 8.88 Out-of-home activities Household or personal services 34.05 54.89 11.06 33.17 46.37 20.46 Serve passenger 58.67 25.29 16.04 30.80 41.47 27.73 Shopping 60.77 31.81 7.41 63.47 26.33 10.20 Eating and drinking 16.72 72.75 10.53 27.93 44.03 28.04 Socializing 4.05 72.47 23.48 5.51 54.04 40.45 Passive leisure 12.05 79.46 8.49 21.85 58.38 19.78 Active leisure 26.39 65.17 8.44 32.48 51.52 16.00 Religious, civic, volunteer 14.89 68.03 17.08 39.69 41.04 19.27 Miscellaneous 37.05 46.28 16.67 35.50 42.13 22.36 Overall (out of home) 31.53 55.07 13.40 32.75 43.57 23.68 Travel activities Driver 68.40 23.98 7.62 66.76 22.40 10.84 Passenger 50.22 41.27 8.52 54.42 32.54 13.05 Walk or bike 49.53 44.00 6.47 58.16 29.20 12.64 Public transportation 25.23 68.43 6.34 41.07 44.32 14.61 Overall (travel) 60.94 31.26 7.79 61.39 26.81 11.80 HH = household.