I have written some answers that are short, concise and accurate. But I get a message that indicates that my answer is of poor quality. I would appreciate hearing some thoughts on this.
As someone who knows little about statistics I try to contribute here on Meta to repay what I learn on the main site.
Looking only on your newest answer: I did not learn much from it. It is just pointing towards external references, failing to be a self-contained answer. You mention a paper of yours, but do not provide a reference; how should anyone know which paper you are talking about?
I have written some answers that are short, concise and accurate.
To me that answer is not concise, because it leaves a gap between the question and what the answer might be. Therefore, some users will understand that type of answer as 'very-low-quality' and will flag it for peer-review.
I don't know how the process of hanging notices work, but I guess if the answer is peer reviewed as low quality, it is that (notice) or deletion.
Now, on a more subjective ground; because you are a high reputation user, and have shown yourself to know statistics, the expectations on your participation are high as a matter of quality and didactics, to me, at least.
Note that answers should explain why they're correct; they should give the arguments in any references not simply offer a link or reference (even when a question is a request for a reference, it should explain the reason for the recommendation).
Very short answers often fail to explain anything and quite a few amount to little more than pointing elsewhere.
Quite brief answers are on occasion acceptable, but if they're very short they need to be as complete as possible (that is, there's really nothing more that could be said). Since often very short answers are not suitable answers by Stack Exchange's criteria, they are automatically flagged by the system.