I have two things to say.
First, there is certainly a selection bias. Citizens who go to see an MP have a connection to him. People who come to see you have a connection to you as their MP. It is an important connection. However, in our measures, we also took into account those for whom that is not the case. That is the first point I wanted to make.
There is another point to be considered. You raised a good point concerning the size of federal ridings. We did some research on the work done by members in the ridings. Our initial hypothesis was that the members of the Quebec National Assembly spent more time than federal members in their ridings, because of Quebec government jurisdictions. We were surprised to learn that the federal members spent more time in their ridings in Quebec than the Quebec MNAs, despite the distance between Quebec and the Parliament in Ottawa.