In probability and statistics, a random variable, random quantity, aleatory variable, or stochastic variable is described informally as a variable whose value depends on an outcomes of a random phenomenon. The formal mathematical treatment of random variables is a topic in probability theory. In that context, a random variable is understood as a measurable function defined on a probability space that maps from the sample space to the real numbers.
A random variable's possible values might represent the possible
outcomes of a yet-to-be-performed experiment, or the possible outcomes
of a past experiment whose already-existing value is uncertain (for
example, because of imprecise measurements or quantum uncertainity. They
may also conceptually represent either the results of an "objectively"
random process (such as rolling a die) or the "subjective" randomness
that results from incomplete knowledge of a quantity.
The meaning of the probabilities assigned to the potential values of a
random variable is not part of probability theory itself but is instead
related to philosophical arguments over the interpretation of
probability. The mathematics works the same regardless of the particular
interpretation in use.
As a function, a random variable is required to be measurable, which allows for probabilities to be assigned to sets of its potential values. It is common that the outcomes depend on some physical variables that are not predictable. For example, when tossing a fair coin, the final outcome of heads or tails depends on the uncertain physical conditions. Which outcome will be observed is not certain. The coin could get caught in a crack in the floor, but such a possibility is excluded from consideration.
Random variables can be discrete, that is, taking any of a specified
finite or countable list of values (having a countable range), endowed
with a probability mass function characteristic of the random variable's
probability distribution; or continuous, taking any numerical value in an
interval or collection of intervals (having an uncountable range), via a
probability density function that is characteristic of the random
variable's probability distribution.
\({\displaystyle X\colon \Omega \to E}\) from a set of possible outcomes
\({\displaystyle \Omega }\) to a measurable space \({\displaystyle E}\).
The technical axiomatic definition requires \({\displaystyle \Omega }\) to
be a sample space of a probability triple \({\displaystyle (\Omega
,{\mathcal {F}},\operatorname {P} )}\). The probability that
\({\displaystyle X}\) takes on a value in a measurable set
\({\displaystyle S\subseteq E}\) is written as \({\displaystyle
\operatorname {P} (X\in S)=\operatorname {P} (\{\omega \in \Omega \mid
X(\omega )\in S\})} \)
In many cases, \({\displaystyle X}\) is real-valued, i.e.
\({\displaystyle E=\mathbb {R} }\). . In some contexts, the term random
element is used to denote a random variable not of this form. When the
image (or range) of \({\displaystyle X}\) is countable, the random
variable is called a discrete random variable
and its distribution is a discrete probability distribution, i.e. can be
described by a probability mass function that assigns a probability to
each value in the image of \({\displaystyle X}\).
If the image is uncountably infinite then \({\displaystyle X}\) is called a continuous random variable. In the special case that it is absolutely continuous, its distribution can be described by a probability density function, which assigns probabilities to intervals; in particular, each individual point must necessarily have probability zero for an absolutely [4] continuous random variable. Not all continuous random variables are absolutely continuous, for example a mixture distribution. Such random variables cannot be described by a probability density or a probability mass function.


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Index
A B C D E F G L M N O P R S T U V Z
All Classes All Packages
All Classes All Packages
All Classes All Packages
S
- salary - Variable in class OneNightCar.Person.Employee
- setCardNumber(String) - Method in class OneNightCar.Person.PaymentMethod
-
Sets the PaymentMethod Card Number.
- setCardType(PaymentMethod.CardType) - Method in class OneNightCar.Person.PaymentMethod
-
Sets the PaymentMethod Card Type.
- setCCV(String) - Method in class OneNightCar.Person.PaymentMethod
-
Sets the PaymentMethod CCV.
- setChargePercent(float) - Method in class OneNightCar.Car.ElectricCar
-
Change the Electric OneNightCar.Car ChargePercent .
- setChargePercentAfter(ElectricCar) - Method in class OneNightCar.Rental.ElectricRental
-
Sets the charge of the electric car after the rental
- setCity(String) - Method in class OneNightCar.Person.PersonAddress
-
Sets the Address City.
- setCustomerLevel(Customer.CustomerLevel) - Method in class OneNightCar.Person.Customer
-
Sets the Customer Level.
- setFuelLevel(double) - Method in class OneNightCar.Car.CombustionCar
-
Change the Combustion OneNightCar.Car fuel level .
- setFuelLevelAfter(CombustionCar) - Method in class OneNightCar.Rental.FuelRental
-
Sets the fuelLevel after the rental of the car
- setGPSLatitude(double) - Method in class OneNightCar.Car.Location
-
Change the Latitude Location
- setGPSLongitude(double) - Method in class OneNightCar.Car.Location
-
Change the Longitude Location
- setMaxElectricCarCapacity(int) - Method in class OneNightCar.ParkingArea.ElectricParkingArea
-
sets the max.
- setNewLocation(double, double) - Method in class OneNightCar.Car.OneNightCar.Car
-
Set a new Location of the OneNightCar.Car .
- setNewName(String, String) - Method in class OneNightCar.Person.OneNightCar.Person
-
Sets the Persons first Name and Surname.
- setOdometer(OneNightCar.Rental) - Method in class OneNightCar.Car.OneNightCar.Car
-
Change the OneNightCar.Car odometer .
- setOdometerAfter() - Method in class OneNightCar.Rental.OneNightCar.Rental
-
Sets the odometer to the value after the rental
- setPaymentMethod(PaymentMethod) - Method in class OneNightCar.Person.Customer
-
Sets the Customers Payment Method.
- setPersonAddress(PersonAddress) - Method in class OneNightCar.Person.OneNightCar.Person
-
Sets the Persons Address
- setSalary(float) - Method in class OneNightCar.Person.Employee
-
Sets the Employee new salary.
- setStreet(String) - Method in class OneNightCar.Person.PersonAddress
-
Sets the Address Street.
- setStreetNumber(String) - Method in class OneNightCar.Person.PersonAddress
-
Sets the Address StreetNumber.
- setTypeOfActivity(Employee.TypeOfActivity) - Method in class OneNightCar.Person.Employee
-
Sets the Employee new Type Of Activity.
- setValidThrough(GregorianCalendar) - Method in class OneNightCar.Person.PaymentMethod
-
Sets the PaymentMethod Valid Through.
- setZIP(String) - Method in class OneNightCar.Person.PersonAddress
-
Sets the Address ZIP.
- state - Variable in class OneNightCar.Car.OneNightCar.Car
- State() - Constructor for enum OneNightCar.Car.OneNightCar.Car.State
- street - Variable in class OneNightCar.ParkingArea.ParkingAreaAddress
- street - Variable in class OneNightCar.Person.PersonAddress
- streetNumber - Variable in class OneNightCar.ParkingArea.ParkingAreaAddress
- streetNumber - Variable in class OneNightCar.Person.PersonAddress
- SUPERUSER - OneNightCar.Person.Customer.CustomerLevel
- surname - Variable in class OneNightCar.Person.OneNightCar.Person
- SUV - OneNightCar.Car.OneNightCar.Car.Type
All Classes All Packages


Sequence Scanner
This add-on facilitates the recording and scanning sequences of requests.
In some web applications it is necessary for particular events or pages to be accessed or completed in a certain order.
By recording a sequence and then scanning it, it is possible to ensure such flows happen in an expected manner.
Creating Sequences
One sequence script should be created for each multi-step operation in the application/site being tested.
There are two options for creating sequences:
- In either the Sites tree or History tab select the requests you wish to have included, right click, and
use "Add To Zest Script" (either choosing to create a new script or adding to an existing Sequence script).
- From the main tool bar, use the "Record a New Zest Script..." button, selecting "Sequence" as the type.
Scanning
When a new Active Scan is created there is a "Sequence" tab in which you can choose the sequence(s) to be scanned.
Note: The Sequence tab is only visible when "Show advanced options" is selected.
For Example:
See also
ZAP Multi-step Blog