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It's a useful number for comparing competing companies in the same industry. The number will vary widely across different industries. Return on assets gives an indication of the capital intensity of the company, which will depend on the industry; companies that require large initial investments will generally have lower return on assets. ROAs ...
In the most frequently cited examples, the "unobservable" quantities are parameters that parametrize a known family of probability distributions according to which the data are distributed. In other words, a sufficient statistic T(X) for a parameter θ is a statistic such that the conditional probability of the data X , given T ( X ), does not ...
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The Cramér–Rao bound is stated in this section for several increasingly general cases, beginning with the case in which the parameter is a scalar and its estimator is unbiased.
In a discrete (i.e. finite state) market, the following hold: [2] The First Fundamental Theorem of Asset Pricing: A discrete market on a discrete probability space (,,) is arbitrage-free if, and only if, there exists at least one risk neutral probability measure that is equivalent to the original probability measure, P.
Many variations of the problem have been explored, but most do not lead to a simple closed-form solution. Flexible retirement age can be taken into account. [5] A utility function other than CRRA can be used. Transaction costs can be introduced. For proportional transaction costs the problem was solved by Davis and Norman in 1990. [6]