Here are some important questions to ask in helping to assess whether you have a good dissertation and statistical topic. I recommend that you go through this brief evaluation before you make a commitment to an area of inquiry. This exercise will help to reduce your stress and help to contribute to a topic that you will enjoy and be acceptable to your Committee.
1. Are you genuinely interested in this topic? Are you willing to do the work to become an expert on topic?
2. Do I have the statistical expertise, skills, equipment and resources to address this topic in my research?
3. Don't ask a "so what?" statistical question. Does it have practical value?
4. Do you have an interest in a certain area or a pet area that you really enjoy exploring?
5. Is there a new treatment that you would like to compare to another one or older one, statistically?
6. Is there a gap in the body of knowledge and statistical applications that you would like to fill?
7. Are there contradictions in statistical results published the literature that you would like to address?
8. Does it build upon someone else's statistical work but has a different twist?
9. Is it an original idea or has it been done with conclusive statistical results?