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Arrow BulletData Sources, Methods and Limitation

For the six-month survey, of the 928 telephone interviews that were completed, 536 (58%) were from Mississauga, 352 (38%) were from Brampton and 40 (4%) were from Caledon. Brampton was somewhat over-sampled and Mississauga, somewhat under-sampled, thus the overall results for Peel required “weighting” to eliminate any geographic bias. Results were weighted to reflect the average number of births by municipality over the five-year period 1997 to 2001. The weighting approach was a conservative method, such that the responses from each municipality were not weighted to reflect more than the actual survey responses from that geographic area. For example, Mississauga, which was proportionally undersampled, received a weight set to a value of 1. In contrast, Brampton, which was proportionally oversampled received a weight of less than one. The total number of weighted responses included in the results was 882, with 536 (60.8%) respondents from Mississauga, 306 (34.7%) from Brampton and 40 (4.5%) from Caledon. Because of rounding to whole numbers, there are times when the weighted responses sum to different totals depending on which respondents were included in a given analysis.

Data Sources, Methods and Limitation (PDF 27KB, 2 pages)


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