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.

Macedonia (Roman province)

The Roman province of Macedonia (Latin: Provincia Macedoniae, Greek: Ἐπαρχία Μακεδονίας) was officially established in 146 BC, after the Roman general Quintus Caecilius Metellus defeated Andriscus of Macedon, the last self-styled King of the ancient kingdom of Macedonia in 148 BC, and after the four client republics (the "tetrarchy") established by Rome in the region were dissolved. The province incorporated ancient Macedonia, with the addition of Epirus, Thessaly, and parts of Illyria, Paeonia and Thrace. This created a much larger administrative area, to which the name of 'Macedonia' was still applied. The Dardanians, to the north of the Paeonians, were not included, because they had supported the Romans in their conquest of Macedonia.

Description

Organization

After the reforms of Diocletian in the late 3rd century, Epirus Vetus was split off, and sometime in the 4th century, the province of Macedonia itself was divided into Macedonia Prima in the south and Macedonia Secunda or Salutaris in the north. These provinces were all subordinate to the Diocese of Macedonia, one of three dioceses comprising the praetorian prefecture of Illyricum. When the Prefecture was divided between the Western and Eastern Empires in 379, the Macedonian provinces were included in Eastern Illyricum. With the permanent division of the Empire in 395, Macedonia passed to the East, which would evolve into the Byzantine Empire.

Macedonia (ancient kingdom)

Macedonia or Macedon (/ˈmæsɪˌdɒn/; Greek: Μακεδονία, Makedonía; Ancient: [ma͜akedoní.a͜a]) was an ancient kingdom on the northern periphery of Classical Greece and later the dominant state of Hellenistic Greece. It was ruled during most of its existence initially by the founding dynasty of the Argeads, the intermittent Antipatrids and finally the Antigonids. Home to the Macedonians, the earliest kingdom was centered on the northeastern part of the Greek peninsula, bordered by Epirus to the west, Paeonia to the north, the region of Thrace to the east and Thessaly to the south.

Prior to the fourth century BC, Macedonia was a small kingdom in northern Greece, outside the area dominated by the great city-states of Athens, Sparta and Thebes, and at one time was subordinate to Achaemenid Persia. The reign of Philip II (359–336 BC) saw the rise of Macedonia, when the kingdom rose to control the entire Greek world. With the innovative Macedonian army, Philip defeated the old powers of Athens and Thebes in the decisive Battle of Chaeronea in 338 BC and subdued them, while keeping Sparta in check. His son Alexander the Great pursued his father's effort to command the whole of Greece through the federation of Greek states, a feat he finally accomplished after destroying a revolting Thebes. Alexander then led this force in a large campaign against the Achaemenid Empire, in retaliation for the invasion of Greece in the 5th century BC.

Macedonia (terminology)

The name "Macedonia" is used in a number of competing or overlapping meanings to describe geographical, political and historical areas, languages and peoples in a part of south-eastern Europe. It has been a major source of political controversy since the early 20th century. The situation is complicated because different ethnic groups use different terminology for the same entity, or the same terminology for different entities, with different political connotations.

Historically, the region has presented markedly shifting borders across the Balkan peninsula. Geographically, no single definition of its borders or the names of its subdivisions is accepted by all scholars and ethnic groups. Demographically, it is mainly inhabited by four ethnic groups, three of which self-identify as Macedonians: two, a Bulgarian and a Greek one at a regional level, while a third ethnic Macedonian one at a national level. Linguistically, the names and affiliations of languages and dialects spoken in the region are a source of controversy. Politically, the rights to the extent of the use of the name Macedonia and its derivatives has led to a diplomatic dispute between Greece and the Republic of Macedonia. Despite mediation of the United Nations, the dispute is still pending resolution since 1993, but as a result it was admitted under the provisional reference of the "former Yugoslav Republic of Macedonia", sometimes abbreviated as FYROM.