§ 77.05 – What steps should I follow to calculate sample averages?

(a)    Aggregate the field sample data to the individual service units in your sample after you have identified and corrected any errors in the data. 

(b)   If the unit of sampling and measurement for your sampling plan is one-way bus trips, sum these quantities over individual one-way bus trips in the sample to get sample totals:

(1)   for the entire sample,

(2)   by type of service days,

(3)   by group if your sampling plan is based on service grouping.

(c)    Count the number of one-way bus trips in the sample:

(1)   for the entire sample,

(2)   by type of service days,

(3)   by group if your sampling plan is based on service grouping.

(d)   Divide sample totals by the number of one-way bus trips for the entire sample, by type of service days, or by service group if applicable.