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Modern portfolio theory ( MPT ), or mean-variance analysis, is a mathematical framework for assembling a portfolio of assets such that the expected return is maximized for a given level of risk. It is a formalization and extension of diversification in investing, the idea that owning different kinds of financial assets is less risky than owning ...
Horizontal gene transfer ( HGT) refers to the transfer of genes between distant branches on the tree of life. In evolution, it can scramble the information needed to reconstruct the phylogeny of organisms, how they are related to one another. HGT can also help scientists to reconstruct and date the tree of life, as a gene transfer can be used ...
Title page of Lucubrationes, 1541 edition, one of the first books to use a variant of the word encyclopedia in the title. An encyclopedia ( American English) or encyclopaedia ( British English) [ 1] is a reference work or compendium providing summaries of knowledge, either general or special, in a particular field or discipline. [ 2][ 3 ...
Diversification (marketing strategy) Diversification is a corporate strategy to enter into or start new products or product lines, new services or new markets, involving substantially different skills, technology and knowledge. Diversification is one of the four main growth strategies defined by Igor Ansoff in the Ansoff Matrix: [1] Products.
A simple flowchart representing a process for dealing with a non-functioning lamp. A flowchart is a type of diagram that represents a workflow or process. A flowchart can also be defined as a diagrammatic representation of an algorithm, a step-by-step approach to solving a task. The flowchart shows the steps as boxes of various kinds, and their ...
Vertical integration is the degree to which a firm owns its upstream suppliers and its downstream buyers. The differences depend on where the firm is placed in the order of the supply chain. There are three varieties of vertical integration: backward (upstream) vertical integration, forward (downstream) vertical integration, and balanced (both ...
DFFITS. In statistics, DFFIT and DFFITS ("difference in fit (s)") are diagnostics meant to show how influential a point is in a linear regression, first proposed in 1980. [ 1] DFFIT is the change in the predicted value for a point, obtained when that point is left out of the regression: where and are the prediction for point i with and without ...
The Battle of Winwick was fought on 19 August 1648 between a Scottish Royalist army and a Parliamentarian army during the Second English Civil War. The Scottish army invaded north-west England and was attacked and defeated at Preston on 17 August. The surviving Royalists fled south, closely pursued. Two days later, hungry, cold, soaking wet ...