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3.12. The same approach would apply to outbound tourism data when measured in a household survey. When measured at the border, however, only visits, fractions of outbound or of domestic trips will be observable. Usually, there is no time during border surveys to collect data on the person taking the trip. Although the distinction between “trip” and “person taking a trip” might be subtle, it should be borne in mind when comparing data drawn from different sources.
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Box III.1 Estimation (weighting): example of the Travel Survey of Residents of Canada Travel Survey of Residents of Canada estimates are produced based on survey data to which weights are applied, making it possible to inflate those data to agree with Canada’s non‑institutionalized population aged 18 years or over. The weights calculated to produce estimates are person, trip and person‑trip weights. The starting point in creating the person weights is the Labour Force Survey sub‑weight. The person weight is then adjusted to reflect (a) the subsampling of rotation groups on the Labour Force Survey, (b) subsampling of people (aged 18 years or over) within a household, (c) non‑response and (d) calibration to known control totals (age/sex groups, census metropolitan area totals). Person records from the second month of collection are also treated for recall bias. From the person weight, the person‑trip weight is derived by adjusting for (a) identical trips, (b) the ratio of declared to reported trips, (c) reported trips missing essential data and (d) trip‑level non‑response. Person‑trip weights are also treated for outliers, and records from the second month of collection are adjusted for recall bias. These weights are used to estimate trip volume. Finally, the trip weight is derived by dividing the person‑trip weight by the number of adults aged (18 years or over) in the household who accompanied the respondent on the trip. Trip weights are used to estimate expenditures. _____________________________ Source: Statistics Canada (2013). |
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