I can give you an example of a comparison of the survey with the census. In 2011, there were some areas where questions were asked in the short-form census that were the same as in the long-form census, the national long-form survey. If you look at that small number of questions and compare the responses, you have a fairly good idea as to how good or bad the survey is. The census is the census, and everybody had to answer it.
I'll give you an example of one area. In the Toronto metropolitan area, there were hundreds of units that responded. I looked at many indicators, but let's say apartments, so how many apartment buildings existed in various areas of Toronto. The ratio of the response in the short-form census to the survey was 0.25 to 3, and that tells you the error in the survey.
There are ways of comparing those, and in fact StatsCan does it all the time. We have a lot of voluntary surveys, and we test them against the census and we adjust them.