(a) Calculate the forecasted number of trips for each combination of the number of persons per househo and the level of household income. (b) Alternatively, trip rate can be estimated using the following linear regression equation. Trip rate=0.46+ 1.96 × NPERSON + 1.66 × HINCOME Where NPERSON = no. of persons per household (= 5 for 5 or more persons in household); HINCOME = level of household income (= 0 for low income, = 1 for medium income, = 2 for high income) Calculate the forecasted number of trips for each household type using this estimated trip rate. (c) Compare the assumptions and limitations of each method.
(a) Calculate the forecasted number of trips for each combination of the number of persons per househo and the level of household income. (b) Alternatively, trip rate can be estimated using the following linear regression equation. Trip rate=0.46+ 1.96 × NPERSON + 1.66 × HINCOME Where NPERSON = no. of persons per household (= 5 for 5 or more persons in household); HINCOME = level of household income (= 0 for low income, = 1 for medium income, = 2 for high income) Calculate the forecasted number of trips for each household type using this estimated trip rate. (c) Compare the assumptions and limitations of each method.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Q1. The following is the number of trips and the number of households by the number of persons per
household and the level of household income in a given zone.
Persons/hh
1
2
3
4
5 or above
Low
No. of hh
93
72
59
120
13
Persons/household
1
2
3
4
5 or more
Trip No.
222
341
417
1010
107
Income
Medium
Low
120
100
90
150
30
No. of hh
149
138
125
109
37
Trip No.
616
853
1025
1186
457
The forecasted number of households in the study area for a target year is shown below.
High
Income
Medium
280
220
190
180
60
No. of hh
96
27
33
40
33
Trip No.
360
205
381
471
423
High
130
40
50
70
60
Transcribed Image Text:(a) Calculate the forecasted number of trips for each combination of the number of persons per household
and the level of household income.
(b) Alternatively, trip rate can be estimated using the following linear regression equation.
Trip rate=0.46+ 1.96 × NPERSON + 1.66 × HINCOME
Where
NPERSON = no. of persons per household (= 5 for 5 or more persons in household);
HINCOME = level of household income (= 0 for low income, = 1 for medium income, = 2 for high
income)
Calculate the forecasted number of trips for each household type using this estimated trip rate.
(c) Compare the assumptions and limitations of each method.
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