Jan Visman (2 July 1914, in Deventer – 19 February 2006) was a Dutch statistician who played a key role in building a bridge between sampling theory with its homogeneous populations and sampling practice with its heterogeneous sampling units and sample spaces.
Visman studied mining engineering at the Delft University of Technology, and was employed at the Dutch State Mines during the Second World War. He surfaced after the war with a massive amount of test results determined in samples selected from heterogeneous sampling units of coal. In fact, he had gathered so much valuable information that he was encouraged to write a PhD thesis on the sampling of coal. Jan Visman defended his PhD thesis titled "De Monsterneming van Heterogene Binomiale Korrelmengsels, in het Bijzonder Steenkool" at the Technical University of Delft on 17 December 1947.[1]
Visman proved that the variance of the primary sample selection stage (the sampling variance) is the sum of the composition variance and the distribution variance. The composition variance is a measure for variability between particles within primary increments. The distribution variance, in contrast, is a measure for variability between primary increments in a sampling unit, and, thus, for its degree of heterogeneity. He described a simple experiment to estimate the composition and distribution components of the sampling variance. The distribution heterogeneity causes spatial dependence between measured values in ordered sets determined in sampling units and sample spaces.
Visman worked briefly in Ottawa after immigrating to Canada in 1951. Until his retirement in 1976, he headed the Western Regional Laboratories of the Department of Mines and Technical Surveys, which is nowadays known as Energy, Mines & Resources. These laboratories were located in Calgary until 1955 when they moved to Edmonton and are still operating alongside the Alberta Research Council at the Coal Research Centre in Devon, Alberta.
Visman wrote Towards a Common Basis for the Sampling of Materials, Mines Branch Research Report R 93, which was published in July 1962. He participated in ASTM Committees D-5 on Coal and Coke and E-11 on Statistics. ASTM D 2234 Standard Practice for Collection of a Gross Sample of Coal was the first internationally recognized standard to specify a precision estimate for a measured variable. Visman's sampling experiment with small and large increments is described in ASTM D 2234, Annex A1. Test Method for Determining the Variance Components of a Coal. Visman's paper titled A General Sampling Theory was published in the November 1969 issue of Materials Research & Standards.
Jan Visman was an accidental sampling expert because his true calling was coal processing but he became interested in sampling because of his need to understand this process. His innovative work inspired a great deal of progress in sampling theory and practice in many scientific disciplines. His brilliant mind succumbed long before he died on February 19, 2006. Jan Visman's contribution to the bridging of the breach between sampling theory and sampling practice for materials in bulk should be remembered.
Referencesedit
Various authors, Approaches in Material Sampling, Bastiaan Geelhoed, Editor, IOS Press, 2010
Gy, P, "L’Ếchantillonnage des Minerais en Vrac, Tome 1 Théorie Générale", Jan 1967, Revue de L’Industrie Minérale
Gy, P, "L’Ếchantillonnage des Minerais en Vrac, Tome 2, Théorie Générale Erreurs Opératoires Complements", Sep 1971, Revue de L’Industrie Minérale
Merks, J W, Sampling and Weighing of Bulk Solids, Trans Tech Publications, Claustall-Zellerfeld, 1985
Merks, J and Merks, E, Precision Estimates for Ore Reserves, 1991, Erzmetall, October
Merks, J and Merks, E, Metrology in Mineral Exploration, 2009, APCOM, September
Visman, J, De monsterneming van heterogene binomiale korrelmengsels, in het bijzonder steenkool, PhD Thesis, Delft, 1947
Visman, J, Towards a Common Basis for the Sampling of Materials, Research Report R93, Department of Mines, Ottawa, 1962
Visman, J, "A General Sampling Theory", Materials Research and Standards, Vol 9, No 11, 1969
^Visman, J, De monsterneming van heterogene binomiale korrelmengsels, in het bijzonder steenkool, PhD Thesis, Delft, 1947
External linksedit
April 15, 2024
visman, july, 1914, deventer, february, 2006, dutch, statistician, played, role, building, bridge, between, sampling, theory, with, homogeneous, populations, sampling, practice, with, heterogeneous, sampling, units, sample, spaces, visman, studied, mining, eng. Jan Visman 2 July 1914 in Deventer 19 February 2006 was a Dutch statistician who played a key role in building a bridge between sampling theory with its homogeneous populations and sampling practice with its heterogeneous sampling units and sample spaces Visman studied mining engineering at the Delft University of Technology and was employed at the Dutch State Mines during the Second World War He surfaced after the war with a massive amount of test results determined in samples selected from heterogeneous sampling units of coal In fact he had gathered so much valuable information that he was encouraged to write a PhD thesis on the sampling of coal Jan Visman defended his PhD thesis titled De Monsterneming van Heterogene Binomiale Korrelmengsels in het Bijzonder Steenkool at the Technical University of Delft on 17 December 1947 1 Visman proved that the variance of the primary sample selection stage the sampling variance is the sum of the composition variance and the distribution variance The composition variance is a measure for variability between particles within primary increments The distribution variance in contrast is a measure for variability between primary increments in a sampling unit and thus for its degree of heterogeneity He described a simple experiment to estimate the composition and distribution components of the sampling variance The distribution heterogeneity causes spatial dependence between measured values in ordered sets determined in sampling units and sample spaces Visman worked briefly in Ottawa after immigrating to Canada in 1951 Until his retirement in 1976 he headed the Western Regional Laboratories of the Department of Mines and Technical Surveys which is nowadays known as Energy Mines amp Resources These laboratories were located in Calgary until 1955 when they moved to Edmonton and are still operating alongside the Alberta Research Council at the Coal Research Centre in Devon Alberta Visman wrote Towards a Common Basis for the Sampling of Materials Mines Branch Research Report R 93 which was published in July 1962 He participated in ASTM Committees D 5 on Coal and Coke and E 11 on Statistics ASTM D 2234 Standard Practice for Collection of a Gross Sample of Coal was the first internationally recognized standard to specify a precision estimate for a measured variable Visman s sampling experiment with small and large increments is described in ASTM D 2234 Annex A1 Test Method for Determining the Variance Components of a Coal Visman s paper titled A General Sampling Theory was published in the November 1969 issue of Materials Research amp Standards Jan Visman was an accidental sampling expert because his true calling was coal processing but he became interested in sampling because of his need to understand this process His innovative work inspired a great deal of progress in sampling theory and practice in many scientific disciplines His brilliant mind succumbed long before he died on February 19 2006 Jan Visman s contribution to the bridging of the breach between sampling theory and sampling practice for materials in bulk should be remembered References editVarious authors Approaches in Material Sampling Bastiaan Geelhoed Editor IOS Press 2010 Gy P L Ếchantillonnage des Minerais en Vrac Tome 1 Theorie Generale Jan 1967 Revue de L Industrie Minerale Gy P L Ếchantillonnage des Minerais en Vrac Tome 2 Theorie Generale Erreurs Operatoires Complements Sep 1971 Revue de L Industrie Minerale Merks J W Sampling and Weighing of Bulk Solids Trans Tech Publications Claustall Zellerfeld 1985 Merks J and Merks E Precision Estimates for Ore Reserves 1991 Erzmetall October Merks J and Merks E Metrology in Mineral Exploration 2009 APCOM September Visman J De monsterneming van heterogene binomiale korrelmengsels in het bijzonder steenkool PhD Thesis Delft 1947 Visman J Towards a Common Basis for the Sampling of Materials Research Report R93 Department of Mines Ottawa 1962 Visman J A General Sampling Theory Materials Research and Standards Vol 9 No 11 1969 Visman J De monsterneming van heterogene binomiale korrelmengsels in het bijzonder steenkool PhD Thesis Delft 1947External links editVisman s sampling equations Visman s sampling theory in practice Retrieved from https en wikipedia org w index php title Jan Visman amp oldid 1061280470, wikipedia, wiki, book, books, library,
