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Informally, the expected value is the mean of the possible values a random variable can take, weighted by the probability of those outcomes. Since it is obtained through arithmetic, the expected value sometimes may not even be included in the sample data set; it is not the value you would expect to get in reality.
The information gain in decision trees (,), which is equal to the difference between the entropy of and the conditional entropy of given , quantifies the expected information, or the reduction in entropy, from additionally knowing the value of an attribute . The information gain is used to identify which attributes of the dataset provide the ...
The proposition in probability theory known as the law of total expectation, [1] the law of iterated expectations [2] (LIE), Adam's law, [3] the tower rule, [4] and the smoothing theorem, [5] among other names, states that if is a random variable whose expected value is defined, and is any random variable on the same probability space, then
Expected value of perfect information, the price that one would be willing to pay in order to gain access to perfect information; Expected value of sample information, the expected increase in utility that a decision-maker could obtain from gaining access to a sample of additional observations before making a decision
Elephind – text searchable free database with access to over 200 million items from 4,345 newspaper titles. Florida Digital Newspaper Collection; Georgia (US State) Historic Newspapers - provides 984 newspaper titles from 1763 to the present day. Google News Archive — an unsupported (abandoned) database. Most useful to find a specific date ...
A project value is computed for each scenario, and the expected commercial value is obtained by multiplying each situation's value by the scenario odds and adding the results. Depending on the procedures used to estimate the value of the project under each scenario, ECV can be a useful way to address project uncertainties.
In probability and statistics, a realization, observation, or observed value, of a random variable is the value that is actually observed (what actually happened). The random variable itself is the process dictating how the observation comes about.
The page is structured in a hierarchical manner so that areas that have a disproportionate number of news providers don't get a disproportionate amount of space. It also allows us to see which areas are lacking in news sites. Note that Wikinews, a sister project of Wikipedia, offers a wiki-style news service.