Statisticians

624 quotes found

"In organisms of all kinds the young are launched upon their careers endowed with a certain amount of biological capital derived from their parents. This varies enormously in amount in different species, but, in all, there has been, before the offspring is able to lead an independent existence, a certain expenditure of nutriment in addition, almost universally, to some expenditure of time or activity, which the parents are induced by their instincts to make for the advantage of their young. Let us consider the reproductive value of these offspring at the moment when this parental expenditure on their behalf has just ceased. If we consider the aggregate of an entire generation of such offspring it is clear that the total reproductive value of the males in this group is exactly equal to the total value of all the females, because each sex must supply half the ancestry of all future generations of the species. From this it follows that the sex ratio will so adjust itself, under the influence of Natural Selection, that the total parental expenditure incurred in respect of children of each sex, shall be equal; for if this were not so and the total expenditure incurred in producing males, for instance, were less than the total expenditure incurred in producing females, then since the total reproductive value of the males is equal to that of the females, it would follow that those parents, the innate tendencies of which caused them to produce males in excess, would, for the same expenditure, produce a greater amount of reproductive value; and in consequence would be the progenitors of a larger fraction of future generations than would parents having a congenital bias towards the production of females. Selection would thus raise the sex-ratio until the expenditure upon males became equal to that upon females."

- Ronald Fisher

0 likesBiologists from EnglandMathematicians from EnglandAgronomistsEugenicistsStatisticians
"[W]e have to get rid of the common illusion that the axioms of moral conduct, which are or appear to be natural to ourselves, must be those of every other sane and reasonable human being. The very existence of the Anthropological Institute should be construed into a standing protest against such narrowness of view. The world of human mind and instinct is richly variegated, persons even of the same sex and race differing sometimes more widely than ordinary men differ from ordinary women, though of course in other ways, and this amount of difference is indeed large. Foreigners say that we are stiff, and that our naturally narrow powers of sympathy are still further contracted by insular prejudices. Be this as it may, it is certain that the English do not excel in winning the hearts of other nations. They have to broaden their sympathies by the study of mankind as they are, and without prejudice. This is precisely what the Anthropologists of all nations aim at doing, and in consequence they continually succeed in discovering previously unsuspected connections between the present and past forms of society, between the mind of the child and of the man, and between the customs, creeds, and institutions of barbarians and of civilised peoples. Anthropology teaches us to sympathise with other races, and to regard them as kinsmen rather than aliens. In this aspect it may be looked upon as a pursuit of no small political value."

- Francis Galton

0 likesAnthropologists from EnglandEugenicistsGeographers from EnglandInventorsStatisticians
"In the earlier part of his memoir, Sir Bartle Frere had compared our mode of treating uncivilized races to that of the Romans. He heartily wished that the resemblance held in certain essential points. Our military hold was as firm, our tolerance of local customs was as great, our dealings were as just, and more just than theirs. But we did not amalgamate with them as the Romans did, we did not intermarry; by means of our missionaries we pressed upon them a form of religion which was not the most congenial. Our civilization was stiff. This, and much more, was pointed out in a very able and most pathetic memoir by Mr. Blyden, the present Minister of Liberia to England, who is a full-blooded negro. The article appeared in Frazer’s Magazine some years ago, and it showed the repressive effect of White civilization upon the Negroes, as contrasted with that of the Mohammedans. It was a shame to us as an Imperial nation, that representatives of the many people whom we governed, did not find themselves more at home among us. They seldom appeared in such meetings as the present one; they did not come to England. We did not see them in the streets. It was very different in ancient Rome, where the presence of foreigners from all parts of the then known world was a characteristic feature of every crowd. He did not now suggest any action, but merely wished to lay stress on this serious drawback to our national character as rulers of a great Empire. He thought they were greatly indebted to Sir Bartle Frere for introducing to public notice so important a subject as the best form of conduct of civilized races towards their less civilized neighbours, and he trusted that it would meet with that full and many-sided discussion which so important a question deserved."

- Francis Galton

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"The long period of the dark ages... is due... in a very considerable degree, to the celebacy enjoined by religious orders on their votaries. Whenever a man or woman was possessed of a gentle nature that fitted... deeds of charity, to meditation, to literature, or to art... they had no refuge elsewhere than in the bosom of the Church. ...celibacy. ...thus, by a policy so singularly unwise and suicidal... the Church brutalized the breed of our forefathers. ...as if she had aimed at selecting the rudest portion of the community to be alone the parents of future generations. She practised the arts which breeders would use, who aimed at creating ferocious, currish, and stupid natures. ... The policy of the religious world in Europe... by means of persecutions... brought thousands of the foremost thinkers and men of political aptitudes to the scaffold, or imprisoned them during a large part of their manhood, or drove them as emigrants into other lands. ...Hence the Church, having first captured all the gentle natures and condemned them to celibacy, made another sweep of her huge nets ...to catch those who were the most fearless, truth-seeking, and intelligent ...and therefore the most suitable parents of a high civilization, and put a strong check, if not a direct stop, to their progeny. Those she reserved... to breed the generations of the future, were the servile, the indifferent, and again, the stupid. Thus, as she... brutalized human nature by her system of celibacy applied to the gentle, she demoralised it by her system of persecution of the intelligent, the sincere, and the free."

- Francis Galton

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"P. Ch. A. Louis, physician of the Hospital de la Pitié, is a man, whose labors and whose writings must become more and more known for ages. I should deem it service enough to my brethren in this country, if I could induce them, one and all, to read and study the works of this great pathologist. M. Louis is the founder of the numerical system, as it has been denominated, in respect to the science of medicine. ...M. Louis has not brought forward a new system of medicine; he has only proposed and pursued a new method in prosecuting the study of medicine. This is nothing else than the method of induction, the method of Bacon, so much vaunted and yet so little regarded. ...To estimate the value of his observations, it is necessary to understand the plan, on which he collected them. First, then, he ascertained when the patient under his examination began to be diseased. Not satisfied with vague answers, he went back to the period, when the patient enjoyed his usual health; and he also endeavored to learn whether that usual health had been firm, or in any respect infirm. He noted also the age, occupation, residence, and manner of living of the patient; likewise any accidents which had occurred, and which might have influenced the disease then affecting him. He ascertained also, as much as possible, the diseases which had occurred in the family of his patient. Secondly, he inquired into the present disease, ascertaining not only what symptoms had marked its commencement, but those which had been subsequently developed and the order of their occurrence; and recording those, which might not seem to be connected with the principal disease, as well as those which were so connected; also, measuring the degree or violence of each symptom, with as much accuracy as the case would admit. Thirdly, he noted the actual phenomena present at his examination, depending for this not only on the statement of the patient, but on his own senses, his eyes, his ears and his hands. Under this and the preceding head he was not satisfied with noting the functions, in which the patient complained of disorder, but examined carefully as to all the functions, recording their state as being healthy or otherwise, and even noticing the absence of symptoms, which might bear on the diagnosis. Thus all secondary diseases, and those, which accidentally co-existed with the principal malady, were brought under his view. Fourthly, he continued to watch his patient from day to day, carefully recording all the changes, which occurred in him till his restoration to health, or his decease. Fifthly, in the fatal cases he exercised the same scrupulous care in examining the dead, as he had in regard to the living subject. Prepared by a minute acquaintance with anatomy, and familiar with the changes wrought by disease, he looked not only at the parts where the principal disorder was manifested, but at all the organs. His notes did not state opinions, but facts. He recorded in regard to each part, which was not quite healthy in its appearance, the changes in color, consistence, firmness, thickness, &c.; not contenting himself with saying that a part was inflamed, or was cancerous, or with the use of any general, but indefinite terms."

- Pierre Charles Alexandre Louis

0 likesPeople from FrancePhysiciansStatisticians
"From the examination of numbers, I believed myself justified in inferring, as a natural consequence, that, in given circumstances, and the influence of the same causes, we may reckon upon witnessing the repetition of the same effects, reproduction of the same crimes, and the same convictions. What has resulted from this exposition? Timorous persons have raised the cry of fatalism. If, however, some one said, "Man is born free; nothing force his free-will; he underlies the influence of external causes; cease to assimilate him to a machine, or to pretend to modify his actions. Therefore, ye legislators, repeal your laws; overturn your prisons; break your chains in pieces; your convictions penalties are of no avail; they are so many acts barbarous revenge. Ye philosophers and priests, speak no more of ameliorations, social or religious; you are materialists, because you assume to society like a piece of gross clay; you are fatalists, because you believe yourselves predestined to influence man in the exercise of his free-will, and to the course of his actions." If, I say, any one held such language to us, we should be disgusted with its excessive folly. And wherefore? Because we are thoroughly convinced that laws, education, and religion exercise a salutary influence on society, and that moral causes have their certain effects."

- Adolphe Quetelet

0 likesAstronomers from BelgiumSociologists from BelgiumStatisticiansCriminologistsMathematicians from Belgium
"Because demography is concerned with human affairs and human populatlons it is possible, in principle, to consider demography as a sub-field of many other subjects. It provided the scope of any particular subject-field like anthropology, genetics, ecology, economics, sociology, etc., and is defined in a sufficiently comprehensive manner. While not denying the possibility of considering demography as a sub-field of one or another subject, at least for certain special purposes, it is suggested that demography should be logically viewed as the totality of convergent and inter-related factors and topics which (although these could be, spearately, the concern of many difl'erent subjects like genetics and anthropology, sociology, education, psychology. economics, social and political affairs etc.) jointly, together with their mutual inter-actions, form the determinants as well as the consequences of growth (or decline), changes in composition, territorial movements, and social mobility of population in different geographical regions or in the world as a whole, at any given period of time, or over difl'erent periods of time. Such a view would supply an aggregative, inter-related, and mutually interacting system of all those factors which have any influence over, or are influenced by, demographic or population changes over space and time."

- Prasanta Chandra Mahalanobis

0 likesAcademics from IndiaEconomists from IndiaScientists from IndiaMathematicians from IndiaStatisticians
"The original work as planned by Clifford was to have been entitled The First Principles of the Mathematical Sciences Explained to the Non-Mathematical and to have contained six chapters on Number, Space, Quantity, Position, Motion, and Mass respectively. ...Shortly before his death he expressed a wish that the book should only be published after very careful revision and that its title should be changed to [our title]. Upon Clifford's death the labour of revision and completion was entrusted to Mr. R. C. Rowe... On the sad death of Professor Rowe... I was requested... to take up the... editing thus left incomplete. ...For the latter half of Chapter III and for the whole of Chapter IV... I am alone responsible. Yet whatever there is in them of value I owe to Clifford; whatever is feeble or obscure is my own. ...With Chapter V. my task has been by no means light. ... I felt it impossible to rewrite the whole without depriving the work of its right to be called Clifford's, and yet at the same time it was absolutely necessary to make considerable changes. ...Without any notice of mass or force it seemed impossible to close a discussion on motion; something I felt must be added. I have accordingly introduced a few pages on the laws of motion [and] since found that Clifford intended to write a concluding chapter on mass. How to express the laws of motion in a form of which Clifford would have approved was indeed an insoluble riddle... because I was unaware of his having written on the subject. I have accordingly expressed... my own views on the subject [i.e.,] a strong desire to see the terms matter and force, together with the ideas associated with them, entirely removed from scientific terminology—to reduce, in fact, all dynamic to kinematic. I should hardly have ventured to put forward these views had I not recently discovered that they have... the weighty authority of Professor Mach... But since writing these pages I have also been referred to a discourse delivered by Clifford at the Royal Institution in 1873, some... of which appeared in Nature June 10, 1880 [pp. 122-123.] Therein it is stated that 'no mathematician can give any meaning to the language about matter, force, inertia used in current text-books of mechanics.' This fragmentary account of the discourse undoubtedly proves that Clifford held on the categories of matter and force as clear and original ideas as on all subjects of which he has treated; only, alas! they have not been preserved. Footnote: Mr. R. Tucker who... searched Clifford's note books... sends me... the following... in Clifford's handwriting: 'Force is not a fact at all, but an idea embodying what is approximately the fact.'"

- Karl Pearson

0 likesUniversity of Cambridge facultyMathematicians from EnglandPhilosophers from EnglandBiographers from EnglandStatisticians
"We may... be treating merely as physical variations effects which are really due to changes in the curvature of our space; whether, in fact, some or all of those causes which we term physical may not be due to the geometrical construction of our space. There are three kinds of variation in the curvature of our space which we ought to consider as within the range of possibility. (i) Our space is perhaps really possessed of a curvature varying from point to point, which we fail to appreciate because we are acquainted with only a small portion of space, or because we disguise its small variations under changes in our physical condition which we do not connect with our change of position. The mind that could recognise this varying curvature might be assumed to know the absolute position of a point. For such a mind the postulate of the relativity of position would cease to have a meaning. It does not seem so hard to conceive such a state of mind as the late Professor Clerk-Maxwell would have had us believe. It would be one capable of distinguishing those so-called physical changes which are really geometrical or due to a change of position in space. (ii) Our space may be really same (of equal curvature), but its degree of curvature may change as a whole with the time. In this way our geometry based on the sameness of space would still hold good for all parts of space, but the change of curvature might produce in space a succession of apparent physical changes. (iii) We may conceive our space to have everywhere a nearly uniform curvature, but that slight variations of the curvature may occur from point to point, and themselves vary with the time. These variations of the curvature with the time may produce effects which we not unnaturally attribute to physical causes independent of the geometry of our space. We might even go so far as to assign to this variation of the curvature of space 'what really happens in that phenomenon which we term the motion of matter.'"

- Karl Pearson

0 likesUniversity of Cambridge facultyMathematicians from EnglandPhilosophers from EnglandBiographers from EnglandStatisticians
"I determined to... investigate how closely the runs, that is, successions of numbers of the same colour were in accord with theory. ...The chance of a head=\frac{1}{2}, of two heads succeeding each other \frac{1}{2}\times\frac{1}{2} = \frac{1}{4}, of three heads \frac{1}{2}\times\frac{1}{2}\times\frac{1}{2} = \frac{1}{8}, and so on. Calling a "set" the run of tosses or the throws of the roulette ball till a change of face or of colour comes, the chance of a change=\frac{1}{2}, of a persistence followed by a change \frac{1}{2}\times\frac{1}{2} = \frac{1}{4}, and so on. ...[I]n the case of the roulette on one occasion the actual deviation is nearly ten times the standard.... The odds are thousand millions to one against such a deviation as nine or ten times the standard. ..My pupil... tabulated... the runs in a second fortnight's play with the result... so improbable that it was only to be expected once in 5000 years of continuous roulette. ...Finally, Mr. de Whalley investigated 7976 throws of the ball, forming a fortnight's play, at a slightly later date... There resulted deviations 4.63, 4.62, and 4.44 times the standard deviation, or odds of upwards of 263,000 to 1... That one such fortnight of runs should have occurred in the year 1892 might be looked upon as a veritable miracle, that three should have occurred is absolutely conclusive. Roulette as played at Monte Carlo is not a scientific game of chance."

- Karl Pearson

0 likesUniversity of Cambridge facultyMathematicians from EnglandPhilosophers from EnglandBiographers from EnglandStatisticians
"The 40-day lockdown was further extended at a time of sporadic expressions of resistance and anger by migrant workers in a few cities. Extreme precarity doesn’t have a singular expression. While some are responding with anger, others are responding with resignation. The severe distress among is not entirely by chance. It has been marinating for a while but the epic new scale has been manufactured due to the unplanned and unilateral decision of a lockdown taken by the prime minister. The arbitrariness and unpreparedness are evident from the confusing messages from the central government concerning transport for migrants. The Ministry of Home Affairs (MHA) issued an order on April 29 permitting inter-state travel for workers who want to return home and instructed the states to appoint nodal officers to develop (SOP). Thereafter the MHA issued another order on May 1 stating that “passenger movement by trains, except for security purposes or for purposes as permitted by MHA” was to be prohibited. This was followed by another order on May 3, which stated: “it is clarified that the MHA orders are meant to facilitate movement of stranded persons who had moved from their native places/ workplaces, just before the lockdown period…” Through these orders, the MHA has taken refuge in obfuscation. Notwithstanding the confusing orders, the constant shuffling of travel modes and costs further expose the central government’s lack of empathy, thought and planning. We present a highly generous estimate for the total travel cost by trains. If all of 6.5 inter-state migrants (Ravi Srivastava’s estimate of the number of migrants) were to return, and assuming an average ticket fare of Rs 650, the total travel cost comes to around Rs 4,200 crore. To put this number in perspective, the cost of the in Gujarat is reportedly Rs 3,000 crore. The PM-Cares as per news reports from early April had Rs 6,500 crore."

- Rajendran Narayanan

0 likesNon-fiction authors from IndiaAcademics from IndiaStatisticiansEducators from India