# random variable types

## random variable types

From this example of Event you should start to see that an event is actually a subset of sample space. One experiment could be — Sum of the two dice greater than 8, other could be — observe when the product of two dice is even, yet another one could be — observe when after subtracting 3 from the product the outcome is even and many more. A discrete distribution is a statistical distribution that shows the probabilities of outcomes with finite values. Since you typically add/subtract/multiply variables and not functions they ended up calling them variables. There are two types of random variables, qualitative (or categorical) and quantitative. The domain of a random variable is a sample space, which is represented as the collection of possible outcomes of a random event. It is commonly used for scientific research purposes. For instance, a variable may be applied to indicate the price of an asset at some point in the future or signal the occurrence of an adverse event. (iii) The number of heads in 20 ﬂips of a coin. Types of Random Variables . A random variable is a variable taking on numerical values determined by the outcome of a random phenomenon. Unlike discrete variables, continuous random variables can take on an infinite number of possible values. satisfy the following: A curve meeting these requirements is known as a density curve. Consider an experiment where a coin is tossed three times. Let’s say that the random variable, Z, is the number on the top face of a die when it is rolled once. Alternately, these variables almost never take an accurately prescribed value c but there is a positive probability that its value will rest in particular intervals which can be very small. For instance, the probability of getting a 3, or P (Z=3), when a die is thrown is 1/6, and so is the probability of having a 4 or a 2 or any other number on all six faces of a die. A discrete random variable can take only a finite number of distinct values such as 0, 1, 2, 3, 4, … and so on. One of the examples of a continuous variable is the returns of stocksRate of ReturnThe Rate of Return (ROR) is the gain or loss of an investment over a period of time copmared to the initial cost of the investment expressed as a percentage. Possible outcomes would be {HH,HT,TH,TT}. You see, the events corresponding to your experiment have inherent uncertainty (randomness) associated with it i.e. The possible values for Z will thus be 1, 2, 3, 4, 5, and 6. In this case, X could be 3 (1 + 1+ 1), 18 (6 + 6 + 6), or somewhere between 3 and 18, since the highest number of a die is 6 and the lowest number is 1. By defining the variable, \(X\), as we have, we created a random variable. Continuous Random Variable: When the random variable can assume an …  https://en.wikipedia.org/wiki/Random_variable,  A nice list of examples for Sample space and Events — https://faculty.math.illinois.edu/~kkirkpat/SampleSpace.pdf,  An answer on math.stackexchange.com that helped me regarding the usage of ‘Variable’ in the term — https://math.stackexchange.com/q/864839. This creation of experiments using a sample space is where the Random Variable starts to use its ‘functional’ powers and map the outcomes to real numbers depending on how you have posed your experiment definition. Statistics Glossary v1.1). A random variable is said to be discrete if it assumes only specified values in an interval. A random variable is a variable whose value is unknown or a function that assigns values to each of an experiment's outcomes. Moreover, statistics concepts can help investors monitor, The Rate of Return (ROR) is the gain or loss of an investment over a period of time copmared to the initial cost of the investment expressed as a percentage. Contrary to the discrete case, \$f(x)\ne P(X=x)\$. Suppose you would like to simulate data There are \$2^4 = 16\$. A random variable is a rule that assigns a numerical value to each outcome in a sample space. Each outcome of a discrete random variable contains a certain probability. \$1024\$ possible outcomes! You see, the outcomes of a given sample space could be used to define many different experiments.

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