# Discrete random variable

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## Discrete random variable

A random variable that can take only a certain specified set of individual possible values-for example, the positive integers 1, 2, 3, . . . For example, stock prices are discrete random variables, because they can only take on certain values, such as \$10.00, \$10.01 and \$10.02 and not \$10.005, since stocks have a minimum tick size of \$0.01. By way of contrast, stock returns are continuous not discrete random variables, since a stock's return could be any number.

## Discrete Random Variable

A variable that can take only one of several definite values. For example, one's FICO score is a discrete random variable because it can only be a positive integer between 300 and 850.
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Statistical correlation means that, given two discrete variables X and Y measured for each case in a sample, variation in X corresponds (or on the contrary, does not) to variation in Y
Mine blast algorithm for optimization of truss structures with discrete variables.
The proposed BLGA can handle MINLBLP with both continuous and discrete variables with one or multiple independent nonlinear and nonconvex lower-level models.
However, these methods are faced with serious limitations in managing non-linear and discontinuous functions and have many local minimum and include discrete variables.
Further, Mike showed that models of discrete variables that allow for changes in variance outperform constant variance specifications.
The MINLP represents a mathematical programming technique which executes the discrete optimization of discrete variables simultaneously with the continuous optimization of continuous variables.
At the other end there is a port information which is characterized by discrete variables, speed and strength, V * c and f * c [6].
It is generally believed that the genetic algorithm (GA) and ant colony optimization (ACO) algorithm are more suitable to handle discrete optimization problems, because of the GA and ACO using discrete coding method and dealing directly with discrete variables.
Both groups were also compared with respect to discrete variables as gender, presence of a ureteric stent, previous ESWL and side of treatment.
Among them, ten phase coefficients are represented as discrete variables, and the other ten are represented as continuous variables.

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