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Leonard Porter Ayres (September 15, 1879 – October 29, 1946) was an American statistician. He played a central role in developing and analyzing large-scale statistical projects, especially for the Russell Sage Foundation. His best-known work dealt with comprehensive statistical studies of American casualties in the first and second world wars. (From Wikipedia) More about Leonard Porter Ayres:
| | Books by Leonard Porter Ayres: Additional books by Leonard Porter Ayres in the extended shelves:![[X-Info]](https://onlinebooks.library.upenn.edu/infouc.gif) Ayres, Leonard Porter, 1879-1946: [Essays]. (Cleveland Trust Company, 1921) (page images at HathiTrust; US access only)- Ayres, Leonard Porter, 1879-1946: The argument for medical inspection of schools and significant facts about medical inspection (Dept. of child hygiene, Russel Sage foundation, 1908), also by Luther Halsey Gulick (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: The automobile industry and its future (The Cleveland trust company, 1921) (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: The automobile industry and its future (The Cleveland Trust Company, 1921), also by Cleveland Trust Company (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: Business in two war periods (The Cleveland trust company, 1945), also by Cleveland Trust Company (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: Child accounting in the public schools. (The Survey committee of the Cleveland foundation, 1915) (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: Cleveland education survey. (The Survey committee of the Cleveland foundation, 1915), also by Cleveland Foundation. Survey Committee (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: Cleveland education survey. [Reports] (The Survey Committee of the Cleveland Foundation, 1915), also by Cleveland Foundation. Survey Committee (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: Cleveland education survey. [Sectional reports̈ .. (Cleveland, O., The Survey Committee of the Cleveland Foundation, 1915), also by Cleveland Foundation. Survey Committee (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: The Cleveland school survey; summary volume. (The Survey Committee of the Cleveland Foundation, 1917), also by Cleveland Foundation. Survey Committee (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: The Cleveland survey of the administration of criminal justice (The Cleveland trust company, 1922) (page images at HathiTrust; US access only)
- Ayres, Leonard Porter, 1879-1946: Constant and variable occupations and their bearing on problems of vocational education. (Division of Education, Russell Sage Foundation, 1914) (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: The economics of recovery (Macmillan, 1933) (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: The economics of recovery (Macmillan Co., 1934) (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: The effect of promotion rates on school efficiency (Division of education, Russell Sage foundation, 1913) (page images at HathiTrust; US access only)
- Ayres, Leonard Porter, 1879-1946: The great events of the great war; a comprehensive and readable source record of the world's great war, emphasizing the more important events, and presenting these as complete narratives in the actual words of the chief officials and most eminent leaders ... presenting documents from government archives and other authoritative sources, with outline narratives, indices, chronologies, and courses of reading on sociological movements and individual national activities (National alumni, 1923), also by Charles F. Horne and Walter F. Austin (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: Greenwich schools from an outside viewpoint ([Greenwich?, 1912) (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: Health work in the public schools. (The Survey committee of the Cleveland foundation, 1915), also by May Ayres Burgess (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: Health Work in the Public Schools, also by May Ayres (Gutenberg ebook)
- Ayres, Leonard Porter, 1879-1946: The identification of the misfit child (New York city, 1911) (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: An index number for state school systems (Department of education, Russell Sage foundation, 1920) (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: Laggards in our schools; a study of retardation and elimination in city school systems (Charities publication committee, 1909) (page images at HathiTrust; US access only)
- Ayres, Leonard Porter, 1879-1946: Laggards in our schools : a study of retardation and elimination in city school systems (Survey Associates, 1913) (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: Lecture no. 4 to accompany part II, book II, the United Y.M.C.A. Schools standard course in salesmanship (New York : Association Press, 1922., 1922), also by Fred C. Kelly and United Y. M. C. A. Schools (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: Leslie's photographic review of the Great War (Leslie-Judge Co., 1921), also by James H. Hare, Woodrow Wilson, John J. Pershing, and Edgar Allen Forbes (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: The measurement of educational processes and products (Division of Education, Russell Sage Foundation, 1912) (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: A measuring scale for ability in spelling (Division of education, Russell Sage foundation, 1915) (page images at HathiTrust; US access only)
- Ayres, Leonard Porter, 1879-1946: Measuring scale for handwriting. (Russell Sage foundation, Division of education, 1917) (page images at HathiTrust; US access only)
- Ayres, Leonard Porter, 1879-1946: Medical inspection legislation (Russell Sage Foundation, Dept. of Child Hygiene, 1911) (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: Medical inspection legislation, comp (Russell Sage foundation, Dept. of child hygiene, 1911) (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: Medical inspection of schools (Charities Publication Committee, 1908), also by Luther Halsey Gulick (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: Medical inspection of schools (Charities publication committee, 1910), also by Luther Halsey Gulick (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: Medical inspection of schools (Survey associates, inc., 1913), also by Luther Halsey Gulick (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: Medical inspection of schools (Russell Sage Foundation, 1917), also by Luther Halsey Gulick (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: The money cost of repetition versus the money saving through acceleration (New York City, 1912) (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: The nature and status of business research, an address delivered at the eighty-third annual meeting of the American Statistical Association at Pittsburgh, Pa., December, 1921 (The Cleveland Trust Company, 1922) (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: Open-air schools (Doubleday, Page & Co., 1910) (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: Open air schools (Dept. of School Hygiene, 1910) (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: Open-air schools (Doubleday, Page & Co., 1911) (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: Price changes and business prospects (Cleveland trust company, 1921), also by Cleveland Trust Company (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: The progress of preparedness (The Cleveland Trust Company, 1940) (page images at HathiTrust; US access only)
- Ayres, Leonard Porter, 1879-1946: The prospects for building construction in American cities (The Cleveland trust company, 1922) (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: The prospects for building construction in American cities (The Cleveland Trust Company, 1922) (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: The public library and the public schools. (The Survey committee of the Cleveland foundation, 1916), also by Adele McKinnie (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: The public schools of Springfield, Illinois (Division of education, Russell Sage foundation, 1914) (page images at HathiTrust; US access only)
- Ayres, Leonard Porter, 1879-1946: The public schools of Springfield, Illinois; educational section of the Springfield survey conducted under the direction of Leonard P. Ayres, PH. D. (Division of education, Russell Sage foundation, 1914) (page images at HathiTrust; US access only)
- Ayres, Leonard Porter, 1879-1946: The relation between entering age and subsequent progress among school children ... (New York City, 1912) (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: The relation of physical defects to school progress (Dept. of Child Hygiene of the Russell Sage Foundation, 1909) (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: The relative frequency of the French phonetic elements in a translation of the Ayres' list of the 1000 commonest English words. ([Place of publication not identified] : [publisher not identified], 1924., 1929), also by Adalene M. Coffman (page images at HathiTrust; US access only)
- Ayres, Leonard Porter, 1879-1946: The relative responsibility of school and society for the over-age child ... (New York City, 1911) (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: A scale for measuring the quality of handwriting of adults (Division of education, Russell Sage foundation, 1915) (page images at HathiTrust; US access only)
- Ayres, Leonard Porter, 1879-1946: A scale for measuring the quality of handwriting of school children (Russell Sage Foundation. Dept. of Child Hygiene, 1912) (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: School buildings and equipment (The Survey Committee of the Cleveland Foundation, 1916), also by May Ayres Burgess and Cleveland Foundation. Survey Committee (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: School organization and administration. (The Survey committee of the Cleveland foundation, 1916) (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: Seven great foundations (New York, 1911) (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: A shorter method for computing coefficients of correlation and of regression and the correlation ratio. (Public School Publishing Co., 1920) (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: Some conditions affecting problems of industrial education in 78 American school systems (Division of education, Russell Sage foundation, 1914) (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: Source records of the great war (National alumni, 1923), also by Charles F. Horne and Walter F. Austin (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: Source records of the great war : a comprehensive and readable source record of the world's great war, emphasizing the more important events, and presenting these as complete narratives in the actual words of the chief officials and most eminent leaders ... presenting documents from government archives and other authoritative sources, with outline narratives, indices, chronologies, and courses of reading on sociological movements and individual national activities (National Alumni, 1923), also by Charles F. Horne, Walter F. Austin, and United States. War Department. General Staff (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: Source records of the great war : a comprehensive and readable source record of the world's great war, emphasizing the more important events, and presenting these as complete narratives in the actual words of the chief officials and most eminent leaders presenting documents from government archives and other authoritative sources, with outline narratives, indices, chronologies, and courses of reading on sociological movements and individual national activities (Indianapolis : The American Legion, 1931., 1931), also by Charles F. Horne and Walter F. Austin (page images at HathiTrust; US access only)
- Ayres, Leonard Porter, 1879-1946: The war with Germany; a statistical summary (Govt. print. off., 1919), also by United States. War Department. General Staff (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: The war with Germany; a statistical summary (Govt. print. off., 1919), also by United States. War Dept. General Staff (page images at HathiTrust)
- Ayres, Leonard Porter, 1879-1946: The war with Germany; a statistical summary (Govt. print. off., 1919), also by United States. War dept. General staff (page images at HathiTrust)
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