§ 55.09 – May I change sampling plans during a report year?

(a)    You should not change sampling plans during the same report year if you have not made major changes to your service. 

(b)   You should increase the necessary sample size by 50% with the same template sampling plan you used during the first part of the year if you have made major changes to your service.  For example, if you were sampling 4 one-way bus trips each week before the major changes, you should change to sample 8 one-way bus trips each week after those changes.

(c)    Table 55.01 shows this guidance in a tabular format.

Table 55.01.  Tabular Guidance on Changing Sampling Plans in a Report year

If you

then you should

by

have not made major changes to your service

not change your sampling plan during a report year

 

you have made major changes to your service

adjust your sampling plan during a report year

increasing the necessary sample size by 50%