Overview

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## arithmetic mean

Overview page. Subjects: Social Sciences — Psychology.

In descriptive statistics, the average value, calculated (for a finite set of scores) by adding the scores together and then dividing the total by the number of scores. Often referred to...

## average

Overview page. Subjects: Business and Management.

1 (USA). Term sometimes used for index. Hence the Dow-Jones average.

2 One of a range of statistics used to describe a series of numbers (cf. arithmetic...

## beta distribution

Overview page. Subjects: Probability and Statistics.

If X is a random variable with probability density function given by where B(α, β) is a beta function and λ, ν, x all>0, then we say that X has a beta distribution with parameters α, β....

## bimodal distribution

Overview page. Subjects: Science and Mathematics.

Any probability distribution or frequency distribution with two modes, therefore appearing visually with two peaks, indicating a clustering of scores around two different values.

## binomial distribution

Overview page. Subjects: Probability and Statistics.

The discrete probability distribution for the number of successes when n independent experiments are carried out, each with the same probability p of success. The probability mass function...

## Cauchy distribution

Overview page. Subjects: Probability and Statistics.

A continuous random variable with probability density function f given by , where k>0 and m are parameters, is said to have a Cauchy distribution.

The graph of f is a bell-curve...

## central tendency

Overview page. Subjects: Sociology.

In descriptive statistics, the middle or typical value of any probability distribution or set of scores, usually measured by the arithmetic mean, median, or mode.

## chi-square distribution

Overview page. Subjects: Mathematics.

In statistics, a probability distribution used to obtain an approximate measure of the discrepancy between sets of observed and expected scores and to perform a chi-square test. If a set of...

## expected

Overview page. Subjects: Economics.

1 The most likely outcome in a stochastic process (cf. average; mean; mode).

2 The result that is anticipated from a position (cf. downside; upside).

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## gamma distribution

Overview page. Subjects: Economics — Probability and Statistics.

A frequency distribution often used to characterize the distribution of financial returns. It differs from a normal distribution in its skewness (lack of symmetry). Compare leptokurtic...