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Item Tree Analysis
Item tree analysis (ITA) is a data analytical method which allows constructing a hierarchical structure on the items of a questionnaire or test from observed response patterns. Assume that we have a questionnaire with ''m'' items and that subjects can answer positive (1) or negative (0) to each of these items, i.e. the items are dichotomous. If ''n'' subjects answer the items this results in a binary data matrix ''D'' with ''m'' columns and ''n'' rows. Typical examples of this data format are test items which can be solved (1) or failed (0) by subjects. Other typical examples are questionnaires where the items are statements to which subjects can agree (1) or disagree (0). Depending on the content of the items it is possible that the response of a subject to an item ''j'' determines her or his responses to other items. It is, for example, possible that each subject who agrees to item ''j'' will also agree to item ''i''. In this case we say that item ''j'' implies item ''i'' (short i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Data Analysis
Data analysis is a process of inspecting, cleansing, transforming, and modeling data with the goal of discovering useful information, informing conclusions, and supporting decision-making. Data analysis has multiple facets and approaches, encompassing diverse techniques under a variety of names, and is used in different business, science, and social science domains. In today's business world, data analysis plays a role in making decisions more scientific and helping businesses operate more effectively. Data mining is a particular data analysis technique that focuses on statistical modeling and knowledge discovery for predictive rather than purely descriptive purposes, while business intelligence covers data analysis that relies heavily on aggregation, focusing mainly on business information. In statistical applications, data analysis can be divided into descriptive statistics, exploratory data analysis (EDA), and confirmatory data analysis (CDA). EDA focuses on discovering ne ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boolean Analysis
Boolean analysis was introduced by Flament (1976).Flament, C. (1976). "L'analyse booleenne de questionnaire", Paris: Mouton. The goal of a Boolean analysis is to detect deterministic dependencies between the items of a questionnaire or similar data-structures in observed response patterns. These deterministic dependencies have the form of logical formulas connecting the items. Assume, for example, that a questionnaire contains items ''i'', ''j'', and ''k''. Examples of such deterministic dependencies are then ''i'' → ''j'', ''i'' ∧ ''j'' → ''k'', and ''i'' ∨ ''j'' → ''k''. Since the basic work of Flament (1976) a number of different methods for Boolean analysis have been developed. See, for example, Buggenhaut and Degreef (1987), Duquenne (1987), item tree analysis Leeuwe (1974), Schrepp (1999), or Theuns (1998). These methods share the goal to derive deterministic dependencies between the items of a questi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Item Response Theory
In psychometrics, item response theory (IRT) (also known as latent trait theory, strong true score theory, or modern mental test theory) is a paradigm for the design, analysis, and scoring of tests, questionnaires, and similar instruments measuring abilities, attitudes, or other variables. It is a theory of testing based on the relationship between individuals' performances on a test item and the test takers' levels of performance on an overall measure of the ability that item was designed to measure. Several different statistical models are used to represent both item and test taker characteristics. Unlike simpler alternatives for creating scales and evaluating questionnaire responses, it does not assume that each item is equally difficult. This distinguishes IRT from, for instance, Likert scaling, in which ''"''All items are assumed to be replications of each other or in other words items are considered to be parallel instruments".A. van Alphen, R. Halfens, A. Hasman and T. Imbos. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Results Of ITA For ISSP 1995 Question 4
A result is the outcome of an event. Result or Results may also refer to: Music * ''Results'' (album), a 1989 album by Liza Minnelli * ''Results'', a 2012 album by Murder Construct * "The Result", a single by The Upsetters * "The Result", a song by Ennio Morricone from ''A Fistful of Dollars'' O.S.T. Other uses * ''Result'' (schooner), a schooner built in Carrickfergus in 1893 * Result, New York, a populated place in Greene County * Result (cricket) * ''Results'' (film), a 2015 film starring Guy Pearce and Cobie Smulders * Results (organisation), a US poverty advocacy organization founded 1980 See also * Result merchant, see Glossary of contract bridge terms#R * ''Results May Vary'', an album by Limp Bizkit 2003 * Causality * Find (other) Find, FIND or Finding may refer to: Computing * find (Unix), a command on UNIX platforms * find (Windows), a command on DOS/Windows platforms Books * ''The Find'' (2010), by Kathy Page * ''The Find'' (2014), by William Hope Hodgso ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Western Germany
The old states of Germany (german: die alten Länder) is a jargon referring to the ten of the sixteen states of the Federal Republic of Germany (FRG) that were part of West Germany and that unified with the eastern German Democratic Republic's 5 states, which are given the contrasting term New states of Germany. Usage of this terminology usually excludes one other state, Berlin, conterminous with the capital city of the reunified nation which used to be divided, with its western part linked with West Germany. The old states are Baden-Württemberg, Bavaria, Bremen, Hamburg, Hesse, Lower Saxony, North Rhine-Westphalia, Rhineland-Palatinate, Saarland, and Schleswig-Holstein. The state of Berlin, the result of a merger between East and West Berlin, is usually not considered one of the old states although West Berlin was associated with the Federal Republic of Germany, but its status was disputed because of the Four Power Agreement on Berlin. Demographics In the old states, the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
National Identity
National identity is a person's identity or sense of belonging to one or more states or to one or more nations. It is the sense of "a nation as a cohesive whole, as represented by distinctive traditions, culture, and language". National identity may refer to the subjective feeling one shares with a group of people about a nation, regardless of one's legal citizenship status. National identity is viewed in psychological terms as "an awareness of difference", a "feeling and recognition of 'we' and 'they'". National identity also includes the general population and diaspora of multi-ethnic states and societies that have a shared sense of common identity identical to that of a nation while being made up of several component ethnic groups. Hyphenated ethnicities are an example of the confluence of multiple ethnic and national identities within a single person or entity. As a collective phenomenon, national identity can arise as a direct result of the presence of elements from the "c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Value System
In ethics and social sciences, value denotes the degree of importance of something or action, with the aim of determining which actions are best to do or what way is best to live (normative ethics in ethics), or to describe the significance of different actions. Value systems are prospective and prescriptive beliefs; they affect the ethical behavior of a person or are the basis of their intentional activities. Often primary values are strong and secondary values are suitable for changes. What makes an action valuable may in turn depend on the ethical values of the objects it increases, decreases, or alters. An object with "ethic value" may be termed an "ethic or philosophic good" (noun sense). Values can be defined as broad preferences concerning appropriate courses of actions or outcomes. As such, values reflect a person's sense of right and wrong or what "ought" to be. "Equal rights for all", "Excellence deserves admiration", and "People should be treated with respect and dignit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Minority Group
The term 'minority group' has different usages depending on the context. According to its common usage, a minority group can simply be understood in terms of demographic sizes within a population: i.e. a group in society with the least number of individuals is therefore the 'minority'. However, in terms of sociology, economics, and politics; a demographic which takes up the smallest fraction of the population is not necessarily the 'minority'. In the academic context, 'minority' and 'majority' groups are more appropriately understood in terms of hierarchical power structures. For example, in South Africa during Apartheid, white Europeans held virtually all social, economic, and political power over black Africans. For this reason, black Africans are the 'minority group', despite the fact that they outnumber white Europeans in South Africa. This is why academics more frequently use the term 'minority group' to refer to a category of people who experience relative disadvantage as c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Insight
Insight is the understanding of a specific cause and effect within a particular context. The term insight can have several related meanings: *a piece of information *the act or result of understanding the inner nature of things or of seeing intuitively (called noesis in Greek) *an introspection *the power of acute observation and deduction, discernment, and perception, called intellection or noesis *An understanding of cause and effect based on the identification of relationships and behaviors within a model, context, or scenario (see artificial intelligence) An insight that manifests itself suddenly, such as understanding how to solve a difficult problem, is sometimes called by the German word '' Aha-Erlebnis''. The term was coined by the German psychologist and theoretical linguist Karl Bühler. It is also known as an epiphany, eureka moment or (for cross word solvers) the penny dropping moment (PDM). Sudden sickening realisations often identify a problem rather than solving i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Algebra
Algebra () is one of the broad areas of mathematics. Roughly speaking, algebra is the study of mathematical symbols and the rules for manipulating these symbols in formulas; it is a unifying thread of almost all of mathematics. Elementary algebra deals with the manipulation of variables (commonly represented by Roman letters) as if they were numbers and is therefore essential in all applications of mathematics. Abstract algebra is the name given, mostly in education, to the study of algebraic structures such as groups, rings, and fields (the term is no more in common use outside educational context). Linear algebra, which deals with linear equations and linear mappings, is used for modern presentations of geometry, and has many practical applications (in weather forecasting, for example). There are many areas of mathematics that belong to algebra, some having "algebra" in their name, such as commutative algebra, and some not, such as Galois theory. The word ''algebra'' is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mathematical Proof
A mathematical proof is an inferential argument for a mathematical statement, showing that the stated assumptions logically guarantee the conclusion. The argument may use other previously established statements, such as theorems; but every proof can, in principle, be constructed using only certain basic or original assumptions known as axioms, along with the accepted rules of inference. Proofs are examples of exhaustive deductive reasoning which establish logical certainty, to be distinguished from empirical arguments or non-exhaustive inductive reasoning which establish "reasonable expectation". Presenting many cases in which the statement holds is not enough for a proof, which must demonstrate that the statement is true in ''all'' possible cases. A proposition that has not been proved but is believed to be true is known as a conjecture, or a hypothesis if frequently used as an assumption for further mathematical work. Proofs employ logic expressed in mathematical symbols ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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