This is a great question. I happened on a website that analyzes your writing style based on what you paste or type in the box. I was interested to find out that my style changed from post to post or piece to piece. I have a funny feeling that the way I write is heavily influenced by things I have read recently. It may not mean much but I find this fascinating and worth investigating. My own style and voice is still being, and will continue to develop for the foreseeable future.
Based on the results of the tool, my writing seems to be similar to the following:
I guess, Neil Gaiman, Dan Brown, H.P. Lovecraft, and Edgar Allan Poe are some of the authors I have taken notes from. I checked many pieces of my writing and these seemed to repeat, so at least it seems consistent.
The voice I use in my book was most like Neil Gaiman, whereas my posts varied between Lovecraft and Dan Brown. Every now and then the analyzer would come up with Edgar Allan Poe, so I must have some small bit of poetic flow during those pieces.
Overall I think it is a good tool to see how your own voice changes. It could be useful for those seeking symmetry throughout a single work, so I recommend trying it out yourself: http://iwl.me/
Let me know who you write like.