Browse Definitions:
Definition

# skewness

Contributor(s): Stan Gibilisco

Skewness is asymmetry in a statistical distribution, in which the curve appears distorted or skewed either to the left or to the right. Skewness can be quantified to define the extent to which a distribution differs from a normal distribution.

In a normal distribution, the graph appears as a classical, symmetrical "bell-shaped curve." The mean, or average, and the mode, or maximum point on the curve, are equal.

• In a perfect normal distribution (green solid curve in the illustration below), the tails on either side of the curve are exact mirror images of each other.
• When a distribution is skewed to the left (red dashed curve), the tail on the curve's left-hand side is longer than the tail on the right-hand side, and the mean is less than the mode. This situation is also called negative skewness.
• When a distribution is skewed to the right (blue dotted curve), the tail on the curve's right-hand side is longer than the tail on the left-hand side, and the mean is greater than the mode. This situation is also called positive skewness.

This was last updated in December 2012

#### Join the conversation

Send me notifications when other members comment.
Opps, Got a question, if a census is skewed to one side, does that mean the census is biased?
Cancel
You got the skewness wrong way round! Left skew is positive skewness, right skew is negative skewness!
Cancel
Can skewness of any data presentation be regarded as bias in any circumstance?
Cancel

## SearchCompliance

• ### risk map (risk heat map)

A risk map, also known as a risk heat map, is a data visualization tool for communicating specific risks an organization faces. A...

• ### internal audit (IA)

An internal audit (IA) is an organizational initiative to monitor and analyze its own business operations in order to determine ...

• ### pure risk (absolute risk)

Pure risk, also called absolute risk, is a category of threat that is beyond human control and has only one possible outcome if ...

## SearchCloudProvider

• ### cloud ecosystem

A cloud ecosystem is a complex system of interdependent components that all work together to enable cloud services.

• ### cloud services

Cloud services is an umbrella term that may refer to a variety of resources provided over the internet, or to professional ...

• ### uncloud (de-cloud)

The term uncloud describes the action or process of removing applications and data from a cloud computing platform.

## SearchSecurity

• ### federated identity management (FIM)

Federated identity management (FIM) is an arrangement that can be made among multiple enterprises to let subscribers use the same...

• ### cross-site scripting (XSS)

Cross-site scripting (XSS) is a type of injection security attack in which an attacker injects data, such as a malicious script, ...

• ### firewall

In computing, a firewall is software or firmware that enforces a set of rules about what data packets will be allowed to enter or...

## SearchHealthIT

• ### 21st Century Cures Act

The 21st Century Cures Act is a wide-ranging healthcare bill that funds medical research and development, medical device ...

• ### vendor neutral archive (VNA)

A vendor neutral archive (VNA) is a technology that stores medical images in a standard format and interface, making them ...

• ### HITECH (Health Information Technology for Economic and Clinical Health) Act of 2009

The HITECH (Health Information Technology for Economic and Clinical Health) Act of 2009 is legislation that was created to ...

## SearchDisasterRecovery

• ### crisis management plan (CMP)

A crisis management plan (CMP) is a document that outlines the processes an organization will use to respond to a critical ...

• ### business continuity and disaster recovery (BCDR)

Business continuity and disaster recovery (BCDR) are closely related practices that describe an organization's preparation for ...

• ### business continuity plan (BCP)

A business continuity plan (BCP) is a document that consists of the critical information an organization needs to continue ...

## SearchStorage

A bad block is an area of storage media that is no longer reliable for storing and retrieving data because it has been physically...

• ### all-flash array (AFA)

An all-flash array (AFA), also known as a solid-state storage disk system, is an external storage array that uses only flash ...

• ### volume manager

A volume manager is software within an operating system (OS) that controls capacity allocation for storage arrays.

## SearchSolidStateStorage

• ### hybrid hard disk drive (HDD)

A hybrid hard disk drive is an electromechanical spinning hard disk that contains some amount of NAND Flash memory.

Close