Professor Christopher Stewart Wallace (26 October 1933—7 August 2004) was an Australian computer scientist (and physicist, etc.) notable for having devised: October 26 is the 299th day of the year (300th in leap years) in the Gregorian Calendar, with 66 days remaining. ... 1933 (MCMXXXIII) was a common year starting on Sunday (link will take you to calendar). ... August 7 is the 219th day of the year in the Gregorian Calendar (220th in leap years), with 146 days remaining. ... 2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar. ... Computer science (informally: CS or compsci) is, in its most general sense, the study of computation and information processing, both in hardware and in software. ... A physicist is a scientist trained in physics. ...

• The minimum message length principle (Wallace and Boulton, 1968, WB1968) - an information-theoretic principle in statistics, econometrics and machine learning which can be seen both as a mathematical formalisation of Occam's Razor and as an invariant Bayesian method of model selection and point estimation.
• The Wallace tree multiplier (see multiplication ALU).

He was appointed Foundation Chair of Computer Science at Monash University in 1968, and Professor Emeritus in 1996. Minimum message length (MML) is a formal information theory restatement of Occams Razor: even when models are not equal in goodness of fit accuracy to the observed data, the one generating the shortest overall message is more likely to be correct (where the message consists of a statement of... A graph of a bell curve in a normal distribution showing statistics used in educational assessment, comparing various grading methods. ... Econometrics literally means economic measurement. It is a combination of mathematical economics, statistics, economic statistics and economic theory. ... As a broad subfield of artificial intelligence, Machine learning is concerned with the development of algorithms and techniques, which allow computers to learn. At a general level, there are two types of learning: inductive, and deductive. ... William of Ockham Occams razor (also spelled Ockhams razor) is a principle attributed to the 14th-century English logician and Franciscan friar William of Ockham. ... Bayesian inference is statistical inference in which evidence or observations are used to update or to newly infer the probability that a hypothesis may be true. ... Wallace tree is an efficient hardware implementation of multiplication of two integers. ... In digital design, a multiplier or multiplication ALU is a hardware circuit dedicated to multiplying two binary values. ...

External links

• Christopher S. Wallace publications, and searchable publications database
• Wallace, C.S. (posthumous, 2005), Statistical and Inductive Inference by Minimum Message Length, Springer (Series: Information Science and Statistics), 2005, XVI, 432 pp., 22 illus., Hardcover, ISBN 0-387-23795-X. (Links to chapter headings, table of contents and sample pages.)