1. Lexis Wilhelm Lexis. Born 17 July 1837 in Eschweiler (near Aachen), Germany Died 25 Oct1914 in Göttingen, Germany. Click the picture above to see a larger version http://www-gap.dcs.st-and.ac.uk/~history/Mathematicians/Lexis.html

Wilhelm Lexis Born: 17 July 1837 in Eschweiler (near Aachen), Germany Died: Click the picture above to see a larger version Show birthplace location Previous (Chronologically) Next Biographies Index Previous (Alphabetically) Next Main index Wilhelm Lexis attended the University of Bonn where he was awarded a degree in mathematics and then went on to write a thesis on analytical mechanics. He graduated in 1859 and then went to Heidelberg where he undertook research in Bunsen's chemistry laboratories. Despite the fact that his training up to this point had been a broad one, in 1861 Lexis went to Paris to study social sciences. These studies led to his first publication in 1870 which was on the export policies of France. Heiss writes in [4]:- This work displays the feature that characterises his later economic writings: a scepticism towards "pure economics" and towards the application of supposedly descriptive mathematical models which have no reference to economic reality. Even in this early work he insisted that economic theory should be founded on quantitative economic data. In 1872 Lexis was appointed as professor of economics at the University of Strassburg. He held this post for two years and during this time he worked on his second major publication on the theory of population which was published in 1875. By this time, however, he was in Dorpat having been appointed to the chair of geography, ethnology and statistics in 1874. Again he held this post for only two years before he was appointed to the chair of economics at Freiburg.

2. Poster Of Lexis Wilhelm Lexis. lived from 1837 to 1914. Lexis studied data presentedas a series over time thus initiating the study of time series. http://www-gap.dcs.st-and.ac.uk/~history/Posters2/Lexis.html

Wilhelm Lexis lived from 1837 to 1914 Lexis studied data presented as a series over time thus initiating the study of time series. Find out more at http://www-history.mcs.st-andrews.ac.uk/history/ Mathematicians/Lexis.html

3. Lexis Wilhelm Lexis. Born 17 July 1837 From 187679 Wilhelm Lexis studieddata presented as a series over time. He initiated the study http://intranet.woodvillehs.sa.edu.au/pages/resources/maths/History/Lxs.htm

Wilhelm Lexis Born: 17 July 1837 in Eschweiler, Germany Died: Show birthplace location Previous (Chronologically) Next Biographies Index Previous (Alphabetically) Next Welcome page From 1876-79 Wilhelm Lexis studied data presented as a series over time. He initiated the study of time series with his 1879 article On the theory of the stability of statistical series Lexis required a binomial dispersion for his series to be stable and this ruled out most interesting series. However it applied to the problem of year to year fluctuation of the sex ratio among children born in a city. It posed the question of whether an empirical index of dispersion is consistent with the assumption that sex is governed by a simple chance mechanism. References (2 books/articles) References elsewhere in this archive: A poster of this mathematician is available Previous (Chronologically) Next Biographies Index Previous (Alphabetically) Next Welcome page History Topics Index Famous curves index ... Search Suggestions JOC/EFR December 1996 The URL of this page is: http://www-history.mcs.st-andrews.ac.uk/history/Mathematicians/Lexis.html

4. Grands Auteurs En Sciences économiques Translate this page 1924) Leontiev Wassily (1906-1999) Lerner Abba (1903-1982) Leroy-Beaulieu Paul (1843-1916)Lewis Arthur W. (1915-1991) lexis wilhelm (1837-1914) Lindahl Erik http://www.aix-mrs.iufm.fr/formations/filieres/ses/ressourcesdocu/auteurssceco.h

Abramovitz Moses (1912-2000) Aftalion Albert (1874-1956) Allen Roy Georges Douglas (1906-1983) Bagehot Walter (1826-1877) Bairoch Paul (1930-1999) Bakounine Michel (1814-1876) Baran Paul (1910-1964) Barone Enrico (1859-1924) Bauer Otto (1882-1950) Bentham Jeremy (1748-1832) Berle Adolf Augustus (1895-1971) Bernstein Edouard (1854-1938) Bertalanfy Ludwig von (1901-1972) Bertrand Joseph (1822-1900) Beveridge William H. (1879-1963) Bodin Jean (1530-1596) Boisguilbert Pierre de (1646-1714) Boukharine Nicolas (1888-1938) Boulding Kenneth E. (1910-1993) Braudel Fernand (1902-1985) Braverman Harry (1920-1976) Burnham James (1905-1987) Cairnes John Elliot (1823-1875) Cantillon Richard (1697-1734) Cassel Gustav (1866-1945) Chamberlin Edward Hastings (1899-1967) Chevalier Michel (1806-1879) Clark Colin Grant (1905-1989) Clark John Bates (1847-1938) Clark John Maurice (1884-1963) Colbert Jean-Baptiste (1619-1683) Commons John Rogers (1862-1945) Condorcet M. C. (1734-1794) Cournot Augustin (1801-1877) Denison Edward F. (1915-192) Dobb Maurice Herbert (1900-1976) Domar Evsey David (1914-1997) Dornbusch Rudiger (1942-2002) Dupont de Nemours Pierre (1739-1817) Dupuit Jules (1804-1866) Edgeworth Francis Ysidro (1845-1925) Emmanuel Arghiri (1911-2001) Engels Friedrich (1820-1895) Fayol Henri (1841-1925) Fisher Irving (1867-1947) Ford Henry (1863-1947) Fourier Charles (1772-1837) Friedmann Georges (1905-1977) Frisch Ragnar (1899-1973) Fullarton John (1790-1849) Garnier Joseph (1813-1881) Georgescu-Roegen Nicolas (1906-1994) Gerschenkron Alexander (1904-1978)

5. Bell Curve - Encyclopedia Article About Bell Curve. Free Access, No Registration and Wilhelm lexis wilhelm Lexis (1837 – 1914) was an eminent German economist andsocial scientist and a founder of the interdisciplinary study of insurance. http://encyclopedia.thefreedictionary.com/Bell Curve

Dictionaries: General Computing Medical Legal Encyclopedia Bell Curve Word: Word Starts with Ends with Definition The normal distribution is an extremely important probability distribution In mathematics, a probability distribution assigns to every interval of the real numbers a probability, so that the probability axioms are satisfied. In technical terms, a probability distribution is a probability measure whose domain is the Borel algebra on the reals. A probability distribution is a special case of the more general notion of a probability measure, which is a function that assigns probabilities satisfying the Kolmogorov axioms to the measurable sets of a measurable space. Click the link for more information. in many fields. It is also called the Gaussian distribution , especially in physics Physics physikos natural physis ): Nature) is the science of Nature in the broadest sense. Physicists study the behaviour and interactions of matter and radiation. The laws of physics are generally expressed as mathematical relations. Physics is very closely related to the other natural sciences, particularly chemistry, the science of molecules and the chemical compounds that they form in bulk. Chemistry draws on many fields of physics, particularly quantum mechanics, thermodynamics and electromagnetism. However, chemical phenomena are sufficiently varied and complex that chemistry is usually regarded as a separate discipline.

6. Lexis cisweb.lexisnexis.com/marketsource/reports.htm - 2k -. lexis wilhelmLexis. Poster of lexis wilhelm Lexis. lived from 1837 to 1914. http://www.all-cars-central.com/lexis.asp

lexis - Offering research on new and used cars, including safety and reliability reports, as well as information on car dealers and autos for sale by owner. Home About Us New Car Reviews Sell Your Car ... Contact Us lexis LexisNexis for law, public records, company data, government, Log in to lexis .com Log in to nexis.com Sign on to your service Description: Products and services for legal, business, academic, and government professionals, available by subscript... Category: www.lexisnexis.com/ - 43k - LexisNexis Research System Home Page LexisNexis TM ID Password* Sign On Tips Remember my Sign On Information Use a secure connection *, For law school customers, password www.lexis.com/ - 16k - www.lexis.com/research/ Similar pages LexisNexis(TM) Academic LexisNexis ID: Password: Your LexisNexis ID and password will be encrypted using SSL. Remember LexisNexis ID and password, Save your web.lexis-nexis.com/universe - 6k - Welcome to LexisNexis for Law Schools LexisNexis research system sign on. Get a Document Case Briefs Shepardize®. lawschool.lexis.com/ - 33k -

7. Biblioteca Argentina Para Ciegos - Catálogo Braille - Varios Translate this page Laberéne Paul, El origen de los mundos, 6, 1977. lexis wilhelm,El comercio, 4, 1692. Lo Gatto Héctor, Historia del teatro ruso,6, 1550. http://www.bac.org.ar/BibBraille/variosb.htm

Varios Volver al catálogo Página Principal AUTOR TÍTULO TOMOS Nº DE ORDEN Alpherat Tratado de astrología Autores Varios La conquista de la tierra Autores Varios La economía... a lo claro Ayudantes Técnicos Sanitarios Unificación de las carreras de practicantes, matronas y enfermeras (1º año) Barón Fernández José Manual de puericultura Batardón León La contabilidad al alcance de todos Bayet C. Historia del arte Beck Lester F. Educación sexual para preadolescentes Berardi Lamberto Apuntes de mineralogía Biblioteca "Los Genios" Los genios de la educación Binayán Narciso Antología didáctica de sarmiento Boll Marcel Qué es: el azar, el vacío, el calor, la luz, la electricidad, el sonido, la afinidad Bonel María Juana Apuntes decorte yconfección Burnet M. Historia de las enfermedades infecciosas Calleja Guijarro Tomás Dramatizaciones Capo Nicolás Cura de naranjas Carbia María A. de +cómo es la cocina mexicana de marichu? Coctor La cocina práctica casera Colaþo María Rosa El niño y la vida Comisión Nacional del Antártico Soberanía argentina en la antártida Compayré G.

8. Les Documents lexis wilhelm Lexis la représentation graphique de la mortalitéau moyen de points mortuaires , Annales de démographie internationale http://fiorano.u-strasbg.fr/lexis/html/docs/docddl.html

les documents Le "vrai" diagramme de Lexis Wilhelm Lexis "la représentation graphique de la mortalité au moyen de points mortuaires", Annales de démographie internationale, IV, 1880, p. 297-324 Source : iconographie et texte Dupâquier (Jacques et Michel), Histoire de la Démographie, Paris, Librairie Académique Perrin, 1985, page 388 Texte explicatif, cité dans Histoire de la Démographie, 462 p. dernière révision : 27 janvier 1998 Fac simile du diagramme de Lexis (Histoire de la Démographie, page 388) Attention, depuis 1880, le diagramme porte le même nom, mais les conventions ont changé ! ... Lisez le texte explicatif et comparez le aux conventions présentées en cours. Les deux schémas ci-dessous vous aideront à comprendre la différence. Retenez que les conventions contiennent une part d'arbitraire, et, qu'en conséquence, il faut les apprendre PAR COEUR. Texte explicatif, cité dans Histoire de la Démographie, page 389 les points chronologiques [...] semblent donc être en quelque sorte étirés sur le plan des points mortuaires, en lignes inclinées à 45° [...]. Ces lignes inclinées nous les appelons "isochrones". Elles servent à limiter les périodes d'observation, comme les horizontales délimitent les rangs d'âge et les verticales, les générations... Tou sles points mortuaires qui tombent entre les lignes N U et N U apparteinnent à la période d'observation N N Zoom sur les "points mortuaires" Où l'on voit nettement les semis de points mortuaires, de densité variable

9. Wilhelm Lexis Wilhelm Lexis. Wilhelm Lexis (1837 – 1914) was an eminent German economist andsocial scientist and a founder of the interdisciplinary study of insurance. http://www.sciencedaily.com/encyclopedia/wilhelm_lexis

Match: sort by: relevance date Free Services Subscribe by email RSS newsfeeds PDA-friendly format loc="/images/" A A A Find Jobs In: Healthcare Engineering Accounting College Contract / Freelance Customer Service Diversity Engineering Executive Healthcare Hospitality Human Resources Information Tech International Manufacturing Nonprofit Retail All Jobs by Job Type All Jobs by Industry Relocating? Visit: Moving Resources Moving Companies Mortgage Information Mortgage Calculator Real Estate Lookup Front Page Today's Digest Week in Review Email Updates ... Outdoor Living Encyclopedia Main Page See live article Wilhelm Lexis Wilhelm Lexis ) was an eminent German economist and social scientist and a founder of the interdisciplinary study of insurance . Born in Eschweiler as the son of a physician, Lexis obtained a Ph.D in Physics from the University of Heidelberg , where he was an assistant of the famous Chemist Robert Bunsen . He then worked as a Gymnasium teacher librarian , and journalist , until in he became, until extraordinary professor at the newly-refounded German-language Imperial University of Straßburg. In

10. Wilhelm Lexis - Wikipedia Wilhelm Lexis, nato il 17 luglio1837 a Eschweiler (Germania) e morto il 24 agosto 1914 a Göttingen. http://it.wikipedia.org/wiki/Wilhelm_Lexis

Wilhelm Lexis Da Wikipedia, l'enciclopedia libera. Wilhelm Lexis , nato il 17 luglio a Eschweiler (Germania) e morto il 24 agosto a G¶ttingen Statistico ed economo tedesco, contribu¬ notevolmente alla statistica teorica, alle scienze economiche, agli studi della popolazione e alla sociologia Nel si laurea all'universit  di Bonn . Comincia con la matematica e la fisica. Dopo un breve periodo nei laboratori di Bunsen si rec² a Parigi a studiare scienze sociali. Nel insegna alla cattedra di economia di Strassburgo . Nel diventa professore di geografia etnologia e statistica a Dorpat. professore di economia a Friburgo e nel a Breslau. Nel diventa professore di scienze politiche a G¶ttingen dove rimase fino alla sua morte nel I pi¹ importanti contributi alla statistica avvennero tra il [[1876 e il . Insoddisfatto dell'abituale accettazione acritica dell'ipotesi di omogeneit  del campione (ipotesi fatta spesso da Qu©telet e i sui allievi) Lexis descrive una statistica Q (detta oggi Indice di Lexis e usata in parte modificata) per testare l'ipotesi e dimostrando cos­ che spesso non ¨ verificata. m i=1 (p i ij p ij /N p i j X ij /n Con X ij campioni indipendenti Bernoulliani con probabilit  di successo p ij dove ogni i di X ij rappresenta un campione della sottopopolazione i.

11. Utente:Tomi - Wikipedia lexis wilhelm;Markov Andrej Andreevic; Neyman Jerzy; Pearson Egon; Pearson Karl. http://it.wikipedia.org/wiki/Utente:Tomi

Utente:Tomi Da Wikipedia, l'enciclopedia libera. Salve, sono Tomi (spesso comparivo in passato con il raro dominio *bz.aknet.it o con i numeri IP 213.21.174.xxx o 213.21.175.xxx, nella mailinglist wikiit-l risulto come Antonio_BZ). I primissimi contributi portavano il mio vero nome e cognome. Ho cominciato a contribuire al progetto l'8 novembre , in seguito ad una segnalazione nelle rivista informatica italiana LinuxMagazine. I miei contributi riguardano l' Alto Adige , la statistica , l' opensource e prevedevo di contribuire in futuro con argomenti riguardanti l' economia , il commercio equo-solidale e qualsiasi cosa che mi interessa e che approfondisco per conto mio. Cercher² di contribuire pure con immagini (cartine, foto, ecc.). Segnalo i contributi che puzzano di violazione del , in quanto ritengo che la wikipedia debba crescere onestamente. Segnalo per² pure qualche sito che usa la stessa idea di it.wiki , in quanto usa tecnologia wikiwiki oppure (e soprattutto) perch¨ usa la bella licenza GNU FDL http://www.capitancook.com (guida viaggi, in inglese, usa wikiwikiweb) http://dazero.sourceforge.net/

12. Untitled Lexicostatistics. ess1441. lexis, wilhelm. ess1441b. lexis Quotient See Dispersion Theory. ess1441b1. lexis Ratio See Dispersion Theory; lexis, wilhelm. ess1442. Liapunov, Alexander http://www.isye.gatech.edu/~brani/ess2/ess4.htm

Icing The Tails Ideal Power Function Idempotent Matrix Identifiability Identification Keys Identification Problems IF-THEN TESTS See EDITING STATISTICAL DATA Ill-Conditioned System of Equations ILL-Conditioned Matrices See Matrices, ILL-Conditioned Illusory Association Illusory Correlation See Spurious Correlation Imbalance Functions Immigration-Emigration Processes Importance Sampling Improper Distributions Inadmissible Decision Rules Incidence Matrix Inclusion-Exclusion Method Income Distribution Models Income Inequality Measures Incomplete Beta Function (Ratio) Incomplete Block Designs Incomplete Data Incomplete Gamma Function (Ratio) Inconsistent Bias Independent Probability See Contingency Tables Index Numbers Index of Dispersion Index of Fit Index of Industrial Production Indian Statistical Institute Indifference Zone See Least Favorable Configuration Indirect Least Squares See Econometrics Individual Moving-Average Inequality Induced Order Statistics See Multivariate Order Statistics Inductive Logic See Logic In Statistical Reasoning Industry, Statistics in

13. Untitled ess2633b. SUBNORMAL DISPERSION See lexis, wilhelm. ess2634. Subsurvival Function ess2646b2. SUPERNORMAL DISPERSION See lexis, wilhelm. ess2647. Superpopulation Models http://www.isye.gatech.edu/~brani/ess2/ess9.htm

Strata Chart STRATEGY See DECISION THEORY; GAME THEORY STRATIFICATION See OPTIMUM STRATIFICATION; STRATIFIED DESIGNS; STRATIFIED MULTISTAGE SAMPLING; STRATIFIERS (SELECTION OF) Stratified Designs Stratified Multistage Sampling STRATIFIED SAMPLING See MULTI-STRATIFIED SAMPLING; NEYMAN ALLOCATION; OPTIMUM STRATIFICATION; PROBABILITY PROPORTIONAL TO SIZE Stratifiers, Selection of STRAW POLL See ELECTION PROJECTIONS Strength of A Sampling Plan Strength of A Test Strength and Other Properties of An Array STRESS See MULTIDIMENSIONAL SCALING Stress-Strength Models Strict Coherence, Principle of Strip Plots STRIP SAMPLING See STATISTICS IN ANIMAL SCIENCE STRONG LAWS OF LARGE NUMBERS See LAWS OF LARGE NUMBERS STRONGLY ERGODIC CLASS See MARKOV PROCESSES Strong True-Score Theory STRUCTURAL DISTRIBUTION See STRUCTURAL INFERENCE Structural Equation Models STRUCTURAL ESTIMATION See STRUCTURAL INFERENCE Structural Inference Structural Models STRUCTURAL PARAMETER See STRUCTURAL INFERENCE Structural Prediction Structural Probability STRUCTURAL REGRESSION See STRUCTURAL INFERENCE Structural Zeros STRUCTURE FUNCTION See COHERENT STRUCTURE THEORY STRUCTURED MATRICES See PATTERNED COVARIANCES Stuart-Maxwell Test ``STUDENT'' See GOSSET, WILLIAM SEALY

14. Portraits Of Statisticians BESSEL, Friedrich wilhelm 17841846. BHARUCHA-REID, Al T LÉVY, Paul 1886-1971. lexis, wilhelm 1837-1914 http://www.stat.ucla.edu/history/people

Portraits of Statisticians Click here for information about sources To save space, files are saved in gzipped format. Some browsers are set to unzip on the fly. If yours is not, copy the file into your own area and gunzip it. This page is created by Peter M Lee . The original is at the University of York A B C ... Z A ADRAIN, Robert AIRY, Sir George Biddell AITKEN, Alexander Craig ANDERSON, Theodore Wilbur ... ARNAULD, Antoine B BABBAGE, Charles BAILY, Francis BARNARD, George Alfred BARRETT, George ... BOSKOVIC, Rudjer Josip, S.J. 1711-1787 = BOSCOVICH, Ruggiero Giuseppe = BOSCOVICH, Roger Joseph BOWLEY, Sir Arthur Lyon BOX, George Edward Pelham BUFFON, George Louis Leclerc, Comte de BURR, Irving ... BUNYAKOVSKII, Viktor Yakovlevich C CANTELLI, Francesco Paolo CARDANO, Gerolamo CAUCHY, Augustin-Louis When older ... CHEBYSHEFF, Pavnutii Lvovich 1821-1894 = TCHEBYCHEFF, Pafnuty Lvovitch = CEBYSEV, Pafnuty Lvovitch CHERNOFF, Herman COCHRAN, William Gemmell CONDORCET, Marquis de 1743-1794 = CARITAT, Marie-Antoine-Jean-Nicolas COX, Sir David (Roxbee)

15. Biography-center - Letter L k12.va.us/project/Leibniz/leibniz.htm. Leibniz, Gottfried wilhelm. www.islandof-freedom.com/LEIBNIZ.HTM history/Mathematicians/Lexell.html. lexis, wilhelm. www-history.mcs.st-and.ac http://www.biography-center.com/l.html

Visit a random biography ! Any language Arabic Bulgarian Catalan Chinese (Simplified) Chinese (Traditional) Croatian Czech Danish Dutch English Estonian Finnish French German Greek Hebrew Hungarian Icelandic Indonesian Italian Japanese Korean Latvian Lithuanian Norwegian Polish Portuguese Romanian Russian Serbian Slovak Slovenian Spanish Swedish Turkish L 567 biographies www-history.mcs.st-and.ac.uk/~history/Mathematicians/Leger.html www-history.mcs.st-and.ac.uk/~history/Mathematicians/Levy_Paul.html www-history.mcs.st-and.ac.uk/~history/Mathematicians/Lowenheim.html L'Estin, Jacques de www.kfki.hu/~arthp/bio/l/l_estin/biograph.html L'Herbier, Marcel www.lips.org/bio_LHerbier_gb.asp La Caille, Nicolas-Louis www.astrosurf.com/cielextreme/page115E.html La Condamine, Charles de www-history.mcs.st-and.ac.uk/~history/Mathematicians/La_Condamine.html La Faille, Charles de www-history.mcs.st-and.ac.uk/~history/Mathematicians/La_Faille.html La Fontaine, Henri www.nobel.se/peace/laureates/1913/fontaine-bio.html La Fosse, Charles de www.ibiblio.org/wm/paint/auth/la-fosse/ La Fosse, Charles de

16. Lexis Biography of wilhelm lexis (18371914) wilhelm lexis. Born 17 July 1837 in Eschweiler (near Aachen), Germany wilhelm lexis attended the University of Bonn where he was awarded a degree in mathematics and then went http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Lexis.html

Wilhelm Lexis Born: 17 July 1837 in Eschweiler (near Aachen), Germany Died: Click the picture above to see a larger version Show birthplace location Previous (Chronologically) Next Biographies Index Previous (Alphabetically) Next Main index Wilhelm Lexis attended the University of Bonn where he was awarded a degree in mathematics and then went on to write a thesis on analytical mechanics. He graduated in 1859 and then went to Heidelberg where he undertook research in Bunsen's chemistry laboratories. Despite the fact that his training up to this point had been a broad one, in 1861 Lexis went to Paris to study social sciences. These studies led to his first publication in 1870 which was on the export policies of France. Heiss writes in [4]:- This work displays the feature that characterises his later economic writings: a scepticism towards "pure economics" and towards the application of supposedly descriptive mathematical models which have no reference to economic reality. Even in this early work he insisted that economic theory should be founded on quantitative economic data. In 1872 Lexis was appointed as professor of economics at the University of Strassburg. He held this post for two years and during this time he worked on his second major publication on the theory of population which was published in 1875. By this time, however, he was in Dorpat having been appointed to the chair of geography, ethnology and statistics in 1874. Again he held this post for only two years before he was appointed to the chair of economics at Freiburg.

17. Lexis, Wilhelm - Gedächtnis Berlin Translate this page lexis, wilhelm. * 17.07.1837 Eschweiler bei Aachen (RheinProvinz). †24.08.1914 Göttingen (Provinz Hannover). Nationalökonom. Straße http://www.luise-berlin.de/Ehrung/l/lexis_wilhelm.htm

Lexis , Wilhelm * 17.07.1837 Eschweiler bei Aachen (RheinProvinz) www.berlin-geschichte.de

18. Lexisstraße In Treptow Translate this page Name ab, 17.5.1930. Namens- erläuterung, lexis, wilhelm, * 17.7.1837Eschweiler bei Aachen, † 24.8.1914 Göttingen, Nationalökonom. http://www.luise-berlin.de/strassen/Bez15a/L276.htm

Verlauf Name ab Namens- www.berlin-topographie.de

19. Wilhelm Lexis (biography) Breve reseña de la vida de wilhelm lexis en inglés recogida de laspáginas de la Universidad de St. Andrews de Escocia. wilhelm lexis. http://www.terra.es/personal2/xberna/wlexis.htm

Wilhelm Lexis Born: 17 July 1837 in Eschweiler, Germany From 1876-79 Wilhelm Lexis studied data presented as a series over time. He initiated the study of time series with his 1879 article On the theory of the stability of statistical series. Lexis required a binomial dispersion for his series to be stable and this ruled out most interesting series. However it applied to the problem of year to year fluctuation of the sex ratio among children born in a city. It posed the question of whether an empirical index of dispersion is consistent with the assumption that sex is governed by a simple chance mechanism. Article by: J J O'Connor and E F Robertson JOC/EFR December 1996 The URL of this page is: http://www-history.mcs.st-andrews.ac.uk/history/Mathematicians/Lexis.html Retroceder © Ximo Bernà i Torres. Actualizado en 1/5/2001 xberna@teleline.es ximoberna@inicia.es

20. Untitled 4/7. 1772. 230. Launhardt, wilhelm. 4/7. 1832. 170 7/15. 1848. 154. lexis, wilhelm. 7/17. 1837. 165 http://www.unlv.edu/faculty/karstensson/BIRTH1.htm

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