National Association of Realtors

The National Association of Realtors (NAR), whose member brokers are known as Realtors member agents are known as Realtor associates, is the largest trade association and one of the most powerful lobbying groups in North America, having spent more than $99 million between 1999 and 2012. It has over 1.1 million members, including NAR's institutes, societies, and councils, involved in all aspects of the residential and commercial real estate industries. NAR also functions as a self-regulatory organization for real estate brokerage. The organization is headquartered in Chicago.

Overview

The National Association of Realtors was founded on May 13, 1908 as the National Association of Real Estate Exchanges, the founding group being located in Chicago, Illinois. In 1916, the National Association of Real Estate Exchanges changed its name to The National Association of Real Estate Boards. The current name was adopted in 1974.

NAR's members are residential and commercial real estate brokers, real estate salespeople, immovable property managers, appraisers, counselors, and others engaged in all aspects of the real estate (immovable property) industry, where a state license to practice is required. Members belong to one or more of some 1,600 local Realtor boards or associations. They are pledged to a code of ethics and standards of practice, which was adopted in 1913.

Group

Group may refer to:

Groups of people

In science and technology

In mathematics

In chemistry

In computing and the internet

Other uses in science and technology

Other uses

Shot grouping

In shooting, a shot grouping, or simply grouping, is the placement of multiple shots on a target, the shots taken in one shooting session. The closeness of the grouping, the nearness of all the shots to each other, is a measure of the accuracy of a weapon, and a measure of the shooter's consistency and skill.

Uses of the term

For firearms that shoot one round at a time, a shot grouping can be used to measure the accuracy of the system comprised out of weapon as well as the precision and uniformity of the ammunition by fixing the weapon into position on a test mount, and aiming it at a target. Multiple shots using rounds from same type and batch are fired to observe how the weapon groups the shots. If a person holds the weapon and shoots it, the grouping measures the combination of the person's skill and the weapon's accuracy.

In shotgun shooting, the grouping is also called the pattern. The pattern is the spread of shot from a single shotgun shell, measured as the smallest circle containing all the shots on the target. The barrel of a shotgun is designed to deliver a wide or narrow grouping, depending on the expected use. Shooting at close range indicates a cylinder bore barrel to deliver a wide grouping, while for hunting at longer distances such as 50 yards or meters, a choke is recommended for a tighter grouping.

Stratigraphic unit

A stratigraphic unit is a volume of rock of identifiable origin and relative age range that is defined by the distinctive and dominant, easily mapped and recognizable petrographic, lithologic or paleontologic features (facies) that characterize it.

Units must be mappable and distinct from one another, but the contact need not be particularly distinct. For instance, a unit may be defined by terms such as "when the sandstone component exceeds 75%".

Lithostratigraphic units

Sequences of sedimentary and volcanic rocks are subdivided on the basis of their lithology. Going from smaller to larger in scale, the main units recognised are Bed, Member, Formation, Group and Supergroup.

Bed

A bed is a lithologically distinct layer within a member or formation and is the smallest recognisable stratigraphic unit. These are not normally named, but may be in the case of a marker horizon.

Member

A member is a named lithologically distinct part of a formation. Not all formations are subdivided in this way and even where they are recognized, they may only form part of the formation.