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Appendix

Survey Data Accuracy Measures

While considerable effort is made to ensure high standards throughout all stages of collection and processing, the estimates provided in this Service Bulletin are inevitably subject to a certain degree of non-sampling and sampling errors. Examples of non-sampling errors are coverage error, data response error, non-response error and processing error. To the maximum extent possible, these errors are minimized through careful design of the survey questionnaire, verification of the survey data, and follow-up with delinquent respondents to maximize response rates.

Sampling error can be measured by the standard error (or standard deviation) of the estimate. The coefficient of variation (CV) is the estimated standard error percentage of the survey estimate. Estimates with smaller CVs are more reliable than estimates with larger CVs. For the 2007 reference year, the CV for total revenue at the Canada level is 0.004. Generally, any estimate with a CV value of less than 1.1 is considered to be of excellent quality. The coefficients of variation for the estimates of total revenue by NAICS are provided below.

Industry code description
Total revenue
(Coefficient of variation)
Urban Transit systems (NAICS - 485110)
A
Interurban and Rural Bus transportation (NAICS – 485210)
A
School and Employee Bus transportation (NAICS – 485410)
A
Charter Bus industry (NAICS – 485510)
A
Other Transit and Ground Passenger transportation (NAICS – 485990)
A
Sightseeing (NAICS – 487110)
A
Canada
A

Figure 1.1