“You don’t seem to give much thought to the matter in hand,” I said at last, interrupting Holmes’s musical disquisition.
“No data yet,” he answered. “It is a capital mistake to theorize before you have all the evidence. It biases the judgement.”Arthur Conan Doyle (1859–1930) British writer and physician
Story (1886-04), “A Study in Scarlet,” Part 1, ch. 3, Beeton’s Christmas Annual, Vol. 28 (1887-11-21)
(Source)
Quotations about:
insufficient data
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I have no data yet. It is a capital mistake to theorize before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts.
Arthur Conan Doyle (1859–1930) British writer and physician
Story (1891-07), “A Scandal in Bohemia,” ch. 1 [Holmes], The Strand Magazine, Vol. 2, No. 1
(Source)
Collected in The Adventures of Sherlock Holmes, No. 1, ch. 1 (1892).
Holmes uses a similar phrase in The Sign of the Four (1890).