Index

An index is an indirect shortcut derived from and pointing into a greater volume of values, data, information or knowledge. Index may refer to:

Business

Publishing

Database index

A database index is a data structure that improves the speed of data retrieval operations on a database table at the cost of additional writes and storage space to maintain the index data structure. Indexes are used to quickly locate data without having to search every row in a database table every time a database table is accessed. Indexes can be created using one or more columns of a database table, providing the basis for both rapid random lookups and efficient access of ordered records.

An index is a copy of select columns of data from a table that can be searched very efficiently that also includes a low-level disk block address or direct link to the complete row of data it was copied from. Some databases extend the power of indexing by letting developers create indices on functions or expressions. For example, an index could be created on upper(last_name), which would only store the upper case versions of the last_name field in the index. Another option sometimes supported is the use of partial indices, where index entries are created only for those records that satisfy some conditional expression. A further aspect of flexibility is to permit indexing on user-defined functions, as well as expressions formed from an assortment of built-in functions.

Index (statistics)

In statistics and research design, an index is a composite statistic – a measure of changes in a representative group of individual data points, or in other words, a compound measure that aggregates multiple indicators. Indexes summarize and rank specific observations.

Much data in the field of social sciences is represented in various indices such as Gender Gap Index, Human Development Index or the Dow Jones Industrial Average.

Item in indexes are usually weighted equally, unless there are some reasons against it (for example, if two items reflect essentially the same aspect of a variable, they could have a weight of 0.5 each).

Constructing the items involves four steps. First, items should be selected based on their face validity, unidimensionality, the degree of specificity in which a dimension is to be measured, and their amount of variance. Items should be empirically related to one another, which leads to the second step of examining their multivariate relationships. Third, indexes scores are designed, which involves determining their score ranges and weights for the items. Finally, indexes should be validateds, which involves testing whether they can predict indicators related to the measured variable not used in their construction.

Map (band)

Map is an indie pop band from Riverside, CA that consists of Josh Dooley (guitar, Voice, Harmonica), Paul Akers (Keyboards) and Trevor Monks (drums).

Biography

Josh Dooley formed Map in 2000, recording two EPs, Teaching Turtles to Fly, and Eastern Skies, Western Eyes.

Map released their first full length record, Secrets By The Highway, in 2003.

In the summer of 2004, Map released their second full length record, Think Like An Owner. This album was his first record backed by his current band line-up, consisting of Loop (bass), Heather Bray (guitar, voice) and Ben Heywood (drums).

Map released their third EP, San Francisco in the 90s, with more additions to their band line-up, consisting of Paul Akers (keyboards) and Trevor Monks (drums). This album gives tribute to late-80s Brit pop and mid-60s American jangle rock.

Discography

Full-length albums

Map (disambiguation)

A map is a symbolic visual representation of an area.

Map or MAP may also refer to:

Computers

Mathematics and programming

Medicine and biology

Map (butterfly)

The map (Araschnia levana) is a butterfly of the Nymphalidae family. It is common throughout the lowlands of central and eastern Europe, and is expanding its range in Western Europe.

In the UK this species is a very rare vagrant, but there have also been several unsuccessful – and now illegal – attempts at introducing this species over the past 100 years or so: in the Wye Valley in 1912, the Wyre Forest in the 1920s, South Devon 1942, Worcester 1960s, Cheshire 1970s, South Midlands 1990s. All these introductions failed and eggs or larvae have never been recorded in the wild in the UK. (Under the Wildlife and Countryside Act 1981 it is now illegal to release a non-native species into the wild.)

The map is unusual in that its two annual broods look very different. The summer brood are black with white markings, looking like a miniature version of the white admiral and lacking most of the orange of the pictured spring brood.

The eggs are laid in long strings, one on top of the other, on the underside of stinging nettles, the larval foodplant. It is thought that these strings of eggs mimic the flowers of the nettles, thereby evading predators. The larvae feed gregariously and hibernate as pupae.