§ 43.11 – What interval-based ready-to-use sampling plans are available for bus services?

(a)    Table 43.09 shows the available ready-to-use sampling plans for bus services, including bus (MB), commuter bus (CB), bus rapid transit (RB), and trolleybus (TB). 

(b)   Separate sampling plans are available for the base option and the APTL option.

(c)    In determining whether using interval-based sampling plans, you should consider the tradeoff between at least two factors:

(1)   the advantage of using a sampling plan that you have been using for years, and

(2)   the potentially lost opportunity of a lower sample size.

(d)   You should first determine the number of weekly operating days for your next sampling year, and choose the set of sampling plans accordingly.  For example, if you will be operating 7 days a week, you should not consider any of the sets for the other weekly operating patterns.

(e)    You may choose any of the above plan numbers that correspond to the weekly operating pattern of your service.

Table 43.09.  Interval-Based Ready-to-Use Sampling Plans for Bus Services

Plan Number

Frequency of Sampling

Operating 7 Days a Week

Operating 6 Days a Week

Operating 5 Days a Week

Daily One-Way Bus Trips

Total Sample Size for Year

Daily One-Way Bus Trips

Total Sample Size for Year

Daily One-Way Bus Trips

Total Sample Size for Year

Base Option

1

Every Day

2

730

2

624

2

520

2

Every 2nd Day

3

549

3

468

4

520

3

Every 3rd Day

5

610

6

624

7

609

4

Every 4th Day

7

644

9

702

12

780

5

Every 5th Day

10

730

13

819

N/A

N/A

6

Every 6th Day

15

915

N/A

N/A

N/A

N/A

APTL Option

1

Every Day

1

365

1

312

1

260

2

Every 2nd Day

2

366

2

312

3

390

3

Every 3rd Day

3

366

4

416

5

435

4

Every 4th Day

4

368

6

468

8

520

5

Every 5th Day

6

438

8

504

 

 

6

Every 6th Day

10

610