Sorry to nitpick, but I believe that "anecdata" is strictly plural and as such "one anecdata" is grammatically incorrect. It should probably be just "one anecdote", but if you want to emphasize the "data" aspect, I'd go with "one point of anecdata" or more concisely - "one anecdatum".
Somewhat surprisingly to me, "anecdatum" has apparently never yet appeared in print [0], and I'm happy for the two of us to share credit in coining it.
[0] https://books.google.com/ngrams/graph?content=anecdatum