Monthly Archives: February 2013

by Aris Spanos

Few statisticians will dispute that R. A. Fisher (February 17, 1890 – July 29, 1962) is the father of modern statistics; see Savage (1976), Rao (1992). Inspired by William Gosset’s (1908) paper on the Student’s t finite sampling distribution, he recast statistics into the modern model-based induction in a series of papers in the early 1920s. He put forward a theory of optimal estimation based on the method of maximum likelihood that has changed only marginally over the last century. His significance testing, spearheaded by the p-value, provided the basis for the Neyman-Pearson theory of optimal testing in the early 1930s. According to Hald (1998)

“Fisher was a genius who almost single-handedly created the foundations for modern statistical science, without detailed study of his predecessors. When young he was ignorant not only of the Continental contributions but even of contemporary publications in English.” (p. 738)

What is not so well known is that Fisher was the ultimate outsider when he brought about this change of paradigms in statistical science. As an undergraduate, he studied mathematics at Cambridge, and then did graduate work in statistical mechanics and quantum theory. His meager knowledge of statistics came from his study of astronomy; see Box (1978). That, however did not stop him from publishing his first paper in statistics in 1912 (still an undergraduate) on “curve fitting”, questioning Karl Pearson’s method of moments and proposing a new method that was eventually to become the likelihood method in his 1921 paper.

After graduating from Cambridge he drifted into a series of jobs, including subsistence farming and teaching high school mathematics and physics, until his temporary appointment as a statistician at Rothamsted Experimental Station in 1919. During the period 1912-1919 his interest in statistics was driven by his passion for eugenics and a realization that his mathematical knowledge of n-dimensional geometry can be put to good use in deriving finite sample distributions for estimators and tests in the spirit of Gosset’s (1908) paper. Encouraged by his early correspondence with Gosset, he derived the finite sampling distribution of the sample correlation coefficient which he published in 1915 in Biometrika; the only statistics journal at the time, edited by Karl Pearson. To put this result in a proper context, Pearson was working on this problem for two decades and published more than a dozen papers with several assistants on approximating the first two moments of the sample correlation coefficient; Fisher derived the relevant distribution, not just the first two moments.

Due to its importance, the 1915 paper provided Fisher’s first skirmish with the  ‘statistical establishment’. Karl Pearson would not accept being overrun by a ‘newcomer’ lightly. So, he prepared a critical paper with four of his assistants that became known as “the cooperative study”, questioning Fisher’s result as stemming from a misuse of Bayes theorem. He proceeded to publish it in Biometrika in 1917 without bothering to let Fisher know before publication. Fisher was furious at K.Pearson’s move and prepared his answer in a highly polemical style which Pearson promptly refused to publish in his journal. Eventually Fisher was able to publish his answer after tempering the style in Metron, a brand new statistics journal. As a result of this skirmish, Fisher pledged never to send another paper to Biometrika, and declared a war against K.Pearson’s perspective on statistics. Fisher, not only questioned his method of moments as giving rise to inefficient estimators, but also his derivation of the degrees of freedom of his chi-square test. Several, highly critical published papers ensued.[i]

Between 1922 and 1930 Fisher did most of his influential work in recasting statistics, including publishing a highly successful textbook in 1925, but the ‘statistical establishment’ kept him ‘in his place’; a statistician at an experimental station. All his attempts to find an academic position, including a position in Social Biology at the London School of Economics (LSE), were unsuccessful (see Box, 1978, p. 202). Being turned down for the LSE position was not unrelated to the fact that the professor of statistics at the LSE was Arthur Bowley (1869-1957); second only to Pearson in statistical high priesthood.[ii]

Coming of age as a statistician during the 1920s in England, was being awarded the Guy medal in gold, silver or bronze, or at least receiving an invitation to present your work to the Royal Statistical Society (RSS). Despite his fundamental contributions to the field, Fisher’s invitation to RSS would not come until 1934. To put that in perspective, Jerzy Neyman, his junior by some distance, was invited six months earlier! Indeed, one can make a strong case that the statistical establishment kept Fisher away for as long as they could get away with it. However, by 1933 they must have felt that they had to invite Fisher after he accepted a professorship at University College, London. The position was created after Karl Pearson retired and the College decided to split his chair into a statistics position that went to Egon Pearson (Pearson’s son) and a Galton professorship in Eugenics that was offered to Fisher. To make it worse, Fisher’s offer came with a humiliating clause that he was forbidden to teach statistics at University College (see Box, 1978, p. 258); the father of modern statistics was explicitly told to keep his views on statistics to himself!

Fisher’s presentation to the Royal Statistical Society, on December 18th, 1934, entitled “The Logic of Inductive Inference”, was an attempt to summarize and explain his published work on recasting the problem of statistical induction since his classic 1922 paper. Bowley was (self?) appointed to move the traditional vote of thanks and open the discussion. After some begrudging thanks for Fisher’s ‘contributions to statistics in general’, he went on to disparage his new approach to statistical inference based on the likelihood function by describing it as abstruse, arbitrary and misleading. His comments were predominantly sarcastic and discourteous, and went as far as to accuse Fisher of plagiarism, by not acknowledging Edgeworth’s priority on the likelihood function idea (see Fisher, 1935, pp. 55-7). The litany of churlish comments continued with the rest of the old guard: Isserlis, Irwin and the philosopher Wolf (1935, pp. 57-64), who was brought in by Bowley to undermine Fisher’s philosophical discussion on induction. Jeffreys complained about Fisher’s criticisms of the Bayesian approach (1935, pp. 70-2).

To Fisher’s support came … Egon Pearson, Neyman and Bartlett. E. Pearson argued that:

“When these ideas [on statistical induction] were fully understood … it would be realized that statistical science owed a very great deal to the stimulus Professor Fisher had provided in many directions.” (Fisher, 1935, pp. 64-5)

Neyman too came to Fisher’s support, praising Fisher’s path-breaking contributions, and explaining Bowley’s reaction to Fisher’s critical review of the traditional view of statistics as an understandable attachment to old ideas (1935, p. 73).

Fisher, in his reply to Bowley and the old guard, was equally contemptuous:

“The acerbity, to use no stronger term, with which the customary vote of thanks has been moved and seconded … does not, I confess, surprise me. From the fact that thirteen years have elapsed between the publication, by the Royal Society, of my first rough outline of the developments, which are the subject of to-day’s discussion, and the occurrence of that discussion itself, it is a fair inference that some at least of the Society’s authorities on matters theoretical viewed these developments with disfavour, and admitted with reluctance. … However true it may be that Professor Bowley is left very much where he was, the quotations show at least that Dr. Neyman and myself have not been left in his company. … For the rest, I find that Professor Bowley is offended with me for “introducing misleading ideas”. He does not, however, find it necessary to demonstrate that any such idea is, in fact, misleading. It must be inferred that my real crime, in the eyes of his academic eminence, must be that of “introducing ideas”. (Fisher, 1935, pp. 76-82)[iii]

In summary, the pioneering work of Fisher and later supplemented by Egon Pearson and Neyman, was largely ignored by the Royal Statistical Society (RSS) establishment until the early 1930s. By 1933 it was difficult to ignore their contributions, published primarily in other journals, and the ‘establishment’ of the RSS decided to display its tolerance to their work by creating ‘the Industrial and Agricultural Research Section’, under the auspices of which both papers by Neyman and Fisher were presented in 1934 and 1935, respectively. [iv]

In 1943, Fisher was offered the Balfour Chair of Genetics at the University of Cambridge. Recognition from the RSS came in 1946 with the Guy medal in gold, and he became its president in 1952-1954, just after he was knighted! Sir Ronald Fisher retired from Cambridge in 1957. The father of modern statistics never held an academic position in statistics!

References

Bowley, A. L. (1902, 1920, 1926, 1937) Elements of Statistics, 2nd, 4th, 5th and 6th editions, Staples Press, London.

Box, J. F. (1978) The Life of a Scientist: R. A. Fisher, Wiley, NY.

Fisher, R. A. (1912), “On an Absolute Criterion for Fitting Frequency Curves,” Messenger of Mathematics, 41, 155-160.

Fisher, R. A. (1915) “Frequency distribution of the values of the correlation coefficient in samples from an indefinitely large population,” Biometrika, 10, 507-21.

Fisher, R. A. (1921) “On the ‘probable error’ of a coefficient deduced from a small sample,” Metron 1, 2-32.

Fisher, R. A. (1922) “On the mathematical foundations of theoretical statistics,” Philosophical Transactions of the Royal Society, A 222, 309-68.

Fisher, R. A. (1922a) “On the interpretation of c² from contingency tables, and the calculation of p, “Journal of the Royal Statistical Society 85, 87–94.

Fisher, R. A. (1922b) “The goodness of fit of regression formulae and the distribution of regression coefficients,”  Journal of the Royal Statistical Society, 85, 597–612.

Fisher, R. A. (1924) “The conditions under which the x2 measures the discrepancy between observation and hypothesis,” Journal of the Royal Statistical Society, 87, 442-450.

Fisher, R. A. (1925) Statistical Methods for Research Workers, Oliver & Boyd, Edinburgh.

Fisher, R. A. (1935) “The logic of inductive inference,” Journal of the Royal Statistical Society 98, 39-54, discussion 55-82.

Fisher, R. A. (1937), “Professor Karl Pearson and the Method of Moments,” Annals of Eugenics, 7, 303-318.

Gossett, W. S. (1908) “The probable error of the mean,” Biometrika, 6, 1-25.

Hald, A. (1998) A History of Mathematical Statistics from 1750 to 1930, Wiley, NY.

Hotelling, H. (1930) “British statistics and statisticians today,” Journal of the American Statistical Association, 25, 186-90.

Neyman, J. (1934) “On the two different aspects of the representative method: the method of stratified sampling and the method of purposive selection,” Journal of the Royal Statistical Society, 97, 558-625.

Rao, C. R. (1992), “ R. A. Fisher: The Founder of Modern, Statistical Science, 7, 34-48.

RSS (Royal Statistical Society) (1934) Annals of the Royal Statistical Society 1834-1934, The Royal Statistical Society, London.

Savage, L . J. (1976) “On re-reading R. A. Fisher,” Annals of Statistics, 4, 441-500.

Spanos, A. (2008), “Statistics and Economics,” pp. 1057-1097 in The New Palgrave Dictionary of Economics, Second Edition. Eds. Steven N. Durlauf and Lawrence E. Blume, Palgrave Macmillan.

Tippet, L. H. C. (1931) The Methods of Statistics, Williams & Norgate, London.

Would you agree if your (senior) colleague urged you to use his/her book rather than your own –even if you thought doing so would change for the positive the entire history of your field? My guess is that the answer is no (see “add on”). For that matter, would you ever try to insist that your (junior) colleague use your book in teaching a course rather than his/her own notes or book?  Again I guess no. But perhaps you’d be more tactful than were Fisher and Neyman. It wasn’t just Fisher (whose birthday is tomorrow) who seemed to need some anger management training, Erich Lehmann (in conversation and in 2011) points to a number of incidences wherein Neyman is the instigator of gratuitous ill-will. Their substantive statistical and philosophical disagreements, I now think, were minuscule in comparison to the huge animosity that developed over many years. Here’s how Neyman describes a vivid recollection he has of the 1935 book episode to Constance Reid (1998, 126). [i]

A couple of months “after Neyman criticized Fisher’s concept of the complex experiment” Neyman vividly recollects  Fisher stopping by his office at University College on his way to a meeting which was to decide on Neyman’s reappointment[ii]:

“And he said to me that he and I are in the same building… . That, as I know, he has published a book—and that’s Statistical Methods for Research Workers—and he is upstairs from me so he knows something about my lectures—that from time to time I mention his ideas, this and that—and that this would be quite appropriate if I were not here in the College but, say, in California—but if I am going to be at University College, this this is not acceptable to him. And then I said, ‘Do you mean that if I am here, I should just lecture using your book?’ And then he gave an affirmative answer. And I said, ‘Sorry, no. I cannot promise that.’ And then he said, ‘Well, if so, then from now on I shall oppose you in all my capacities.’ And then he enumerated—member of the Royal Society and so forth. There were quite a few. Then he left. Banged the door.”

Imagine if Neyman had replied:

“I’d be very pleased to use Statistical Methods for Research Workers in my class, what else?”

Or what if Fisher had said:

 “Of course you’ll want to use your own notes in your class, but I hope you will use a portion of my text when mentioning some of its key ideas.”

Very unlikely [iii].

How would you have handled it?

Ironically, Neyman did something very similar to Erich Lehmann at Berkeley, and blocked his teaching graduate statistics after one attempt that may have veered slightly off Neyman’s path. But Lehmann always emphasized that, unlike Fisher, Neyman never created professional obstacles for him. [iv]

“add on”: From the earlier discussion, I realized a needed qualification:the answer would have to depend on whether your ideas on the subject were substantially different from the colleague’s. For instance if Neyman were being asked by Lindley, it would be very different.

[i] At the meeting that followed this exchange, Fisher tried to shoot down Neyman’s reappointment, but did not succeed (Reid, 125).

[ii]This is Neyman’s narrative to Reid. I’m sure Fisher would relate these same episodes differently. Let me know if you have any historical material to add. I met Lehmann for the first time shortly after he had worked with Reid on her book, and he had lots of stories. I should have written them all down at the time.

[iii] I find it hard to believe, however, that Fisher would have thrown some of Neyman’s wooden models onto the floor:

“ After the Royal Statistical Society meeting of March 28, relations between workers on the two floors of K.P.’s old preserve became openly hostile. One evening, late that spring, Neyman and Pearson returned to their department after dinner to do some work. Entering they were startled to find strewn on the floor the wooden models which Neyman had used to illustrate his talk on the relative advantages of randomized blocks and Latin squares. They were regularly kept in a cupboard in the laboratory. Both Neyman and Pearson always believed that the models were removed by Fisher in a fit anger.” (Reid 124, noted in Lehmann 2011, p. 59. K.P. is, of course, Karl Pearson.)

[iv] I didn’t want to relate this anecdote without a citation, and finally found one in Reid (215-16). Actually I would have anyway, since Lehmann separately told it to Spanos and me.

Lehmann, E. (2011). Fisher, Neyman and the Creation of Classical Statistics, Springer.

Reid, C (1998), Neyman., Springer

When any scientific conclusion is supposed to be [shown or disproved] on experimental evidence [or data], critics who still refuse to accept the conclusion are accustomed to take one of two lines of attack. They may claim that the interpretation of the [data] is faulty, that the results reported are not in fact those which should have been expected had the conclusion drawn been justified, or that they might equally well have arisen had the conclusion drawn been false. Such criticisms of interpretation are usually treated as falling within the domain of statistics. They are often made by professed statisticians against the work of others whom they regard as ignorant of or incompetent in statistical technique; and, since the interpretation of any considerable body of data is likely to involve computations it is natural enough that questions involving the logical implications of the results of the arithmetical processes implied should be relegated to the statistician. At least I make no complaint of this convention. The statistician cannot evade the responsibility for understanding the processes he applies or recommends. My immediate point is that the questions involved can be dissociated from all that is strictly technical in the statistician’s craft…..

The other type of criticism to which experimental results [or data] are exposed is that the experiment itself was ill designed or, of course, badly executed….This type of criticism is usually made by what I might call a heavyweight authority. Prolonged experience, or at least the long possession of a scientific reputation, is almost a pre-requisite for developing successfully this line of attack. Technical details are seldom in evidence. The authoritative assertion “His controls are totally inadequate” must have temporarily discredited many a promising line of work; and such an authoritarian method of judgment must surely continue, human nature being what it is, so long as [general methods for data generation, modeling and analysis] are lacking…

[T]he subject matter [of this work] has been regarded from the point of view of an experimenter [or data analyst], who wishes to carry out his work competently, and having done so wishes to safeguard his results, so far as they are validly established, from ignorant criticism by different sorts of superior persons.