I put in 15 different samples before I got bored including WOTM entries, some other solo fiction writing pieces, RP posts, and a few non-fiction things pulled from a couple recent threads in the OT section. Here's the list of which authors I got, with the kinds of writing that gave those results listed because I'm too lazy to go through and delete those from each line.
Dan Brown - 2 times (WOTM #15 and #18 entries, the two out of five entered that I lost, hah)
Ursula K. Le Guin - 2 times (WOTM #16 entry and a non-fiction writing sample)
H. P. Lovecraft - 2 times (One non-fiction sample and an old beginning of a novel attempt)
Cory Doctorow - 2 times (An old beginning of a novel attempt and a sci-fi RP post)
William Shakespeare (WOTM #17 entry)
P. G. Wodehouse (WOTM #19 entry)
Oscar Wilde (WOTM #20 entry)
Isaac Asimov (Non-fiction writing sample)
Daniel Defoe (Newest novel beginnings, from NaNoWriMo)
James Fenimore Cooper (Old fiction writing)
Anne Rice (RP post)
So that's neat I guess? My favorite part is how the two WOTM entries that I lost with were the ones that it said were like Dan Brown.
EDIT: For shits and giggles I put this post through the analyzer. H. P. Lovecraft, apparently.