On this website there are a lot of people who are good at algebra and things like that and I see only 3 or 4 people answering analysis questions. I'm referring mainly to PDE and functional analysis. This is a problem in Mathoverflow as well. Why is that??? I think analysis departments are in general the biggest in most math departments.
My feeling is that Math.SE is doing okay in the applied, variational, functional, and harmonic branches of analysis, and doing quite well in the classical real/complex areas. Yes, it could use more people working in nonlinear PDE / geometric analysis. Then again, there aren't that many questions here that would be of real interest to them.
I like this answer given by one of the most active analysts on MathOverflow (source).
Would I like to see more analysts on MO? Yes, but there is absolutely nothing you can do with the software, reputation points, etc. to attract them like there was absolutely nothing you could do with such things to attract me in the first place. It is the content of the site and the general atmosphere plus my personal attitudes and preferences that matter for my decision whether to enter or not and whether to stay or not, and no single person, be he a moderator, a system administrator, or a user can change them. [...]
The only people who can correct the "underrepresentation" of analysts on MO are analysts themselves and they can do it not by telling horror stories like how terrible it is that nobody in their field is here, or how topologists and algebraic geometers dismiss analysis questions as not suitable for the site, or how the typical number of points for a good answer to an analysis question is far below that for a question about categorification of something, but by entering one at a time and starting doing some real work here.