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Table 8.2: Distribution of sample based on household income
Income
Frequency Percentage
Less than 25K
236
11.95
Between 25K & 50K
585
29.62
Greater than 50K
1154
58.43
Table 8.1 indicates that the majority of the population is distributed among household
sizes of “two or three” and “four or more.” We may infer from Table 8.1 that most of the
households are married couples with one or more children. Similarly, Table 8.2 appears to
indicate that the majority of the population is in the high income category (greater than $50,000).
Table 8.3 provides the descriptive statistics for level-of-service variables for all five
modes.
Table 8.3: Descriptive statistics for level-of-service variable
Standard
Minimum Maximum Average
Variables
Deviation
IVTT for DA & SR+2
0.1
59.9
14.1
10.4
(Min)*
OVTT for DA & SR+2
2
2.8
2.3
0.2
(Min)
Travel Distance for DA &
0.1
47.1
10.1
8.2
SR+2 (Miles)
Travel Cost for DA
0.01
11.8
2.5
2.1
(Dollars)
Travel Cost for SR+2
0.01
5.9
1.3
1
(Dollars)
IVTT for Transit (Min)
4.0
25.0
9.2
4
OVTT for Transit (Min)
3.9
18.4
10.3
2.7
Travel Cost for Transit
1.8
1.8
1.8
0
(Dollars)
Trip time for Walk (Min)
29.8
19.6
7.8
0.3
Trip Distance for Walk
1.5
1
0.4
0.1
(Miles)
Trip time for Bike (Min)
0.3
40
23.1
9.8
Trip Distance for Bike
0.1
7.3
4.2
1.8
(Miles)
Frequency
1975
1975
1975
1975
1975
54
54
54
81
81
997
997
DA = drive alone; SR = shared ride
For each level-of-service variable, we report the minimum, maximum, average, standard
deviation, and frequency. The column frequency indicates the number of samples for which the
corresponding mode is available. In order to obtain the availability of walk and bike modes, a
maximum limit of 30 minutes on walking and 40 minutes on biking was imposed and then trips
were appropriately assigned the walk and bike mode availability. An important point to note here
is that only 54 observations/trips have accessibility to transit. The transit availability was
determined using the condition that both origin and destination TAZs were accessible to transit
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