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Top 25 Ronald A. Fisher Quotes (2025 Update)

Ronald A. Fisher Quote: “To consult the statistician after an experiment is finished is often merely to ask him to conduct a post mortem examination. He can perhaps say what the experiment died of.”

1. “To consult the statistician after an experiment is finished is often merely to ask him to conduct a post mortem examination. He can perhaps say what the experiment died of.”

— Ronald A. Fisher

Ronald A. Fisher Quote: “The best time to plan an experiment is after you’ve done it.”

2. “The best time to plan an experiment is after you’ve done it.”

— Ronald A. Fisher

Ronald A. Fisher Quote: “The statistician cannot evade the responsibility for understanding the process he applies or recommends.”

3. “The statistician cannot evade the responsibility for understanding the process he applies or recommends.”

— Ronald A. Fisher

Ronald A. Fisher Quote: “Natural selection is not evolution.”

4. “Natural selection is not evolution.”

— Ronald A. Fisher

Ronald A. Fisher Quote: “Experimental observations are only experience carefully planned in advance, and designed to form a secure basis of new knowledge.”

5. “Experimental observations are only experience carefully planned in advance, and designed to form a secure basis of new knowledge.”

— Ronald A. Fisher

Ronald A. Fisher Quote: “We have the duty of formulating, of summarizing, and of communicating our conclusions, in intelligible form, in recognition of the right of other free minds to utilize them in making their own decisions.”

6. “We have the duty of formulating, of summarizing, and of communicating our conclusions, in intelligible form, in recognition of the right of other free minds to utilize them in making their own decisions.”

— Ronald A. Fisher

Ronald A. Fisher Quote: “Faith Is Not Credulity.”

7. “Faith Is Not Credulity.”

— Ronald A. Fisher

Ronald A. Fisher Quote: “The analysis of variance is not a mathematical theorem, but rather a convenient method of arranging the arithmetic.”

8. “The analysis of variance is not a mathematical theorem, but rather a convenient method of arranging the arithmetic.”

— Ronald A. Fisher

Ronald A. Fisher Quote: “We may consequently state the fundamental theorem of Natural Selection in the form: The rate of increase in fitness of any organism at any time is equal to its genetic variance in fitness at that time.”

9. “We may consequently state the fundamental theorem of Natural Selection in the form: The rate of increase in fitness of any organism at any time is equal to its genetic variance in fitness at that time.”

— Ronald A. Fisher

Ronald A. Fisher Quote: “No isolated experiment, however significant in itself, can suffice for the experimental demonstration of any natural phenomenon; for the “one chance in a million” will undoubtedly occur, with no less and no more than its appropriate frequency, however surprised we may be that it should occur to us.”

10. “No isolated experiment, however significant in itself, can suffice for the experimental demonstration of any natural phenomenon; for the “one chance in a million” will undoubtedly occur, with no less and no more than its appropriate frequency, however surprised we may be that it should occur to us.”

— Ronald A. Fisher

Ronald A. Fisher Quote: “The more highly adapted an organism becomes, the less adaptable it is to any new change.”

11. “The more highly adapted an organism becomes, the less adaptable it is to any new change.”

— Ronald A. Fisher

Ronald A. Fisher Quote: “The best causes tend to attract to their support the worst arguments, which seems to be equally true in the intellectual and in the moral sense.”

12. “The best causes tend to attract to their support the worst arguments, which seems to be equally true in the intellectual and in the moral sense.”

— Ronald A. Fisher

Ronald A. Fisher Quote: “The tendency of modern scientific teaching is to neglect the great books, to lay far too much stress upon relatively unimportant modern work, and to present masses of detail of doubtful truth and questionable weight in such a way as to obscure principles.”

13. “The tendency of modern scientific teaching is to neglect the great books, to lay far too much stress upon relatively unimportant modern work, and to present masses of detail of doubtful truth and questionable weight in such a way as to obscure principles.”

— Ronald A. Fisher

Ronald A. Fisher Quote: “We are quite in danger of sending highly trained and intelligent young men out in the word with tables of erroneous numbers under their arms, and with a dense fog in the place where their brains ought to be.”

14. “We are quite in danger of sending highly trained and intelligent young men out in the word with tables of erroneous numbers under their arms, and with a dense fog in the place where their brains ought to be.”

— Ronald A. Fisher

Ronald A. Fisher Quote: “No practical biologist interested in sexual reproduction would be led to work out the detailed consequences experienced by organisms having three or more sexes; yet what else should he do if he wishes to understand why the sexes are, in fact, always two?”

15. “No practical biologist interested in sexual reproduction would be led to work out the detailed consequences experienced by organisms having three or more sexes; yet what else should he do if he wishes to understand why the sexes are, in fact, always two?”

— Ronald A. Fisher

Ronald A. Fisher Quote: “Inductive inference is the only process known to us by which essentially new knowledge comes into the world.”

16. “Inductive inference is the only process known to us by which essentially new knowledge comes into the world.”

— Ronald A. Fisher

Ronald A. Fisher Quote: “I believe sanity and realism can be restored to the teaching of Mathematical Statistics most easily and directly by entrusting such teaching largely to men and women who have had personal experience of research in the Natural Sciences.”

17. “I believe sanity and realism can be restored to the teaching of Mathematical Statistics most easily and directly by entrusting such teaching largely to men and women who have had personal experience of research in the Natural Sciences.”

— Ronald A. Fisher

Ronald A. Fisher Quote: “This is perhaps the most important book on evolutionary genetics ever written.”

18. “This is perhaps the most important book on evolutionary genetics ever written.”

— Ronald A. Fisher

Ronald A. Fisher Quote: “We have usually no knowledge that any one factor will exert its effects independently of all others that can be varied, or that its effects are particularly simply related to variations in these other factors.”

19. “We have usually no knowledge that any one factor will exert its effects independently of all others that can be varied, or that its effects are particularly simply related to variations in these other factors.”

— Ronald A. Fisher

Ronald A. Fisher Quote: “The academic mind, as we know, is sometimes capable of assuming an aggressive attitude. The official mind, on the contrary, is and has to be, expert in the art of self-defence.”

20. “The academic mind, as we know, is sometimes capable of assuming an aggressive attitude. The official mind, on the contrary, is and has to be, expert in the art of self-defence.”

— Ronald A. Fisher

Ronald A. Fisher Quote: “Fairly large print is a real antidote to stiff reading.”

21. “Fairly large print is a real antidote to stiff reading.”

— Ronald A. Fisher

Featured in: Reading Quotes

Ronald A. Fisher Quote: “However, perhaps the main point is that you are under no obligation to analyse variance into its parts if it does not come apart easily, and its unwillingness to do so naturally indicates that one’s line of approach is not very fruitful.”

22. “However, perhaps the main point is that you are under no obligation to analyse variance into its parts if it does not come apart easily, and its unwillingness to do so naturally indicates that one’s line of approach is not very fruitful.”

— Ronald A. Fisher

Ronald A. Fisher Quote: “Natural selection is a mechanism for generating an exceedingly high degree of improbability.”

23. “Natural selection is a mechanism for generating an exceedingly high degree of improbability.”

— Ronald A. Fisher

Ronald A. Fisher Quote: “The statistician cannot excuse himself from the duty of getting his head clear on the principles of scientific inference, but equally no other thinking man can avoid a like obligation.”

24. “The statistician cannot excuse himself from the duty of getting his head clear on the principles of scientific inference, but equally no other thinking man can avoid a like obligation.”

— Ronald A. Fisher

Ronald A. Fisher Quote: “I believe that no one who is familiar, either with mathematical advances in other fields, or with the range of special biological conditions to be considered, would ever conceive that everything could be summed up in a single mathematical formula, however complex.”

25. “I believe that no one who is familiar, either with mathematical advances in other fields, or with the range of special biological conditions to be considered, would ever conceive that everything could be summed up in a single mathematical formula, however complex.”

— Ronald A. Fisher

Ronald A. Fisher Quote: “No efforts of mine could avail to make the book easy reading.”

26. “No efforts of mine could avail to make the book easy reading.”

— Ronald A. Fisher

Featured in: Reading Quotes

Ronald A. Fisher Quote: “In scientific subjects, the natural remedy for dogmatism has been found in research.”

27. “In scientific subjects, the natural remedy for dogmatism has been found in research.”

— Ronald A. Fisher

Ronald A. Fisher Quote: “After all, it is a common weakness of young authors to put too much into their papers.”

28. “After all, it is a common weakness of young authors to put too much into their papers.”

— Ronald A. Fisher

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