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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 ...
Denis McQuail was born in Wallington, London on 12 April 1935 to Irish immigrant parents Annie (née Mullan) and Christopher McQuail. [4] After schooling at St Anselm's college in Birkenhead, where he showed an aptitude for languages, he spent his national service in the Intelligence Corps learning Russian and studied history at Corpus Christi College, Oxford. [4]
In decision theory, economics, and finance, a two-moment decision model is a model that describes or prescribes the process of making decisions in a context in which the decision-maker is faced with random variables whose realizations cannot be known in advance, and in which choices are made based on knowledge of two moments of those random variables.
Saul Rosenzweig started the conversation on common factors in an article published in 1936 that discussed some psychotherapies of his time. [5] John Dollard and Neal E. Miller's 1950 book Personality and Psychotherapy emphasized that the psychological principles and social conditions of learning are the most important common factors. [6]
In finance, the Markowitz model ─ put forward by Harry Markowitz in 1952 ─ is a portfolio optimization model; it assists in the selection of the most efficient portfolio by analyzing various possible portfolios of the given securities. Here, by choosing securities that do not 'move' exactly together, the HM model shows investors how to ...
Psychology Today is an American media organization with a focus on psychology and human behavior. The publication began as a bimonthly magazine, which first appeared in 1967. The print magazine's reported circulation is 275,000 as of 2023. [ 2 ]
The model was originally rooted in 1930s behaviourism and was largely considered obsolete for a long time, but big data analytics-based mass customisation has led to a modern revival of the basic idea. After that, a shift which rediscovered the relationship between media and people occurred and led to establishment of uses and gratifications ...
It is known that the least squares estimator minimizes the variance of mean-unbiased estimators (under the conditions of the Gauss–Markov theorem). In the estimation theory for statistical models with one real parameter , the reciprocal of the variance of an ( "efficient" ) estimator is called the " Fisher information " for that estimator. [ 7 ]