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HandWiki. Analytica. Encyclopedia. Available online: https://encyclopedia.pub/entry/31130 (accessed on 26 December 2024).
HandWiki. Analytica. Encyclopedia. Available at: https://encyclopedia.pub/entry/31130. Accessed December 26, 2024.
HandWiki. "Analytica" Encyclopedia, https://encyclopedia.pub/entry/31130 (accessed December 26, 2024).
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HandWiki. "Analytica." Encyclopedia. Web. 25 October, 2022.
Analytica
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Analytica is a visual software developed by Lumina Decision Systems for creating, analyzing and communicating quantitative decision models. It combines hierarchical influence diagrams for visual creation and view of models, intelligent arrays for working with multidimensional data, Monte Carlo simulation for analyzing risk and uncertainty, and optimization, including linear and nonlinear programming. Its design, especially its influence diagrams and treatment of uncertainty, is based on ideas from the field of decision analysis. As a computer language, it combines a declarative (non-procedural) structure for referential transparency, array abstraction, and automatic dependency maintenance for efficient sequencing of computation.

visual software simulation multidimensional

1. Hierarchical Influence Diagrams

Analytica models are organized as influence diagrams. Variables (and other objects) appear as nodes of various shapes on a diagram, connected by arrows that provide a visual representation of dependencies. Analytica influence diagrams may be hierarchical, in which a single module node on a diagram represents an entire submodel.

Hierarchical influence diagrams in Analytica serve as an organizational tool. Because the visual layout of an influence diagram matches these natural human abilities both spatially and in the level of abstraction, people are able to take in more information about a model's structure and organization at a glance than is possible with less visual paradigms, such as spreadsheets and mathematical expressions. Managing the structure and organization of a large model can be a significant part of the modeling process, but is substantially aided by the visualization of influence diagrams.

Influence diagrams also serve as a tool for communication. Once a quantitative model has been created and its final results computed, it is often the case that an understanding of how the results are obtained, and how various assumptions impact the results, is far more important than the specific numbers computed. Analytica gives users the ability to help target audiences understand these aspects within their models. The visual representation of an influence diagram quickly communicates an understanding at a level of abstraction that is normally more appropriate than detailed representations such as mathematical expressions or cell formulas. When more detail is desired, users can drill down to increasing levels of detail, speeded by the visual depiction of the model's structure.

The existence of an easily understandable and transparent model supports communication and debate within an organization, and this effect is one of the primary benefits of quantitative model building. When all interested parties are able to understand a common model structure, debates and discussions will often focus more directly on specific assumptions, can cut down on "cross-talk", and therefore lead to more productive interactions within the organization. The influence diagram serves as a graphical representation that can help to make models accessible to people at different levels.

2. Intelligent Multidimensional Arrays

Analytica uses index objects to track the dimensions of multidimensional arrays. An index object has a name and a list of elements. When two multidimensional values are combined, for example in an expression such as

Profit = Revenue − Expenses

where Revenue and Expenses are each multidimensional, Analytica repeats the profit calculation over each dimension, but recognizes when same dimension occurs in both values and treats it as the same dimension during the calculation, in a process called intelligent array abstraction. Unlike most programming languages, there is no inherent ordering to the dimensions in a multidimensional array. This avoids duplicated formulas and explicit FOR loops, both common sources of modeling errors. The simplified expressions made possible by intelligent array abstraction allow the model to be more accessible, interpretable, and transparent.

Another consequence of intelligent array abstraction is that new dimensions can be introduced or removed from an existing model, without requiring changes to the model structure or changes to variable definitions. For example, while creating a model, the model builder might assume a particular variable, for example discount rate, contains a single number. Later, after constructing a model, a user might replace the single number with a table of numbers, perhaps discount_rate broken down by Country and by Economic_scenario. These new divisions may reflect the fact that the effective discount rate is not the same for international divisions of a company, and that different rates are applicable to different hypothetical scenarios. Analytica automatically propagates these new dimensions to any results that depend upon discount_rate, so for example, the result for Net present value will become multidimensional and contain these new dimensions. In essence, Analytica repeats the same calculation using the discount rate for each possible combination of Country and Economic_scenario.

This flexibility is important when exploring computation tradeoffs between the level of detail, computation time, available data, and overall size or dimensionality of parametric spaces. Such adjustments are common after models have been fully constructed as a way of exploring what-if scenarios and overall relationships between variables.

3. Uncertainty Analysis

Incorporating uncertainty into model outputs helps to provide more realistic and informative projections. Uncertain quantities in Analytica can be specified using a distribution function. When evaluated, distributions are sampled using either Latin hypercube, Monte Carlo, or Sobol sampling, then the samples are propagated through the computations to the results. The sampled result distribution and summary statistics can then be viewed directly (mean, fractile bands, probability density function (PDF), cumulative distribution function (CDF)), Analytica supports collaborative decision analysis and probability management through the use of the SIPMath(tm) standard.[1][2]

4. Systems Dynamics Modeling

System dynamics is an approach to simulating the behaviour of complex systems over time. It deals with feedback loops and time delays on the behaviour of the entire system. The Dynamic() function in Analytica allows definition of variables with cyclic dependencies, such as feedback loops. It expands the influence diagram notation, which does not normally allow cycles. At least one link in each cycle includes a time lag, depicted as a gray influence arrow to distinguish it from standard black arrows without time lags.

5. As a Programming Language

Analytica includes a general language of operators and functions for expressing mathematical relationships among variables. Users can define functions and libraries to extend the language.

Analytica has several features as a programming language designed to make it easy to use for quantitative modeling: It is a visual programming language, where users view programs (or "models") as influence diagrams, which they create and edit visually by adding and linking nodes. It is a declarative language, meaning that a model declares a definition for each variable without specifying an execution sequence as required by conventional imperative languages. Analytica determines a correct and efficient execution sequence using the dependency graph. It is a referentially transparent functional language, in that execution of functions and variables have no side effects i.e. changing other variables. Analytica is an array programming language, where operations and functions generalize to work on multidimensional arrays.

6. Applications of Analytica

Analytica has been used for policy analysis, business modeling, and risk analysis.[3] Areas in which Analytica has been applied include energy,[4][5][6][7][8][9] health and pharmaceuticals,[10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] environmental risk and emissions policy analysis,[26][27][28][29][30][31][32][33][34] wildlife management,[35][36][37][38] ecology,[39][40][41][42][43][44][45] climate change,[46][47][48][49][50][51][52][53][54][55] technology and defense,[56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72][73] strategic financial planning,[74][75] R&D planning and portfolio management,[76][77][78] financial services, aerospace,[79] manufacturing[80] and environmental health impact assessment.[81]

7. Editions

The Analytica software runs on Microsoft Windows operating systems. Analytica Free Edition is available for an unlimited time and lets you build models of up to 101 user objects. Analytica Professional, Enterprise, Optimizer are desktop editions with increasing levels of functionality. The Analytica Cloud Platform lets users share models via a server and run them via a web browser. Analytica 6.1 was released in 2021.

8. History

Analytica's predecessor, called Demos,[82] grew from the research on tools for policy analysis by Max Henrion as a PhD student and later professor at Carnegie Mellon University between 1979 and 1990. Henrion founded Lumina Decision Systems in 1991 with Brian Arnold. Lumina continued to develop the software and apply it to environmental and public policy analysis applications. Lumina first released Analytica as a product in 1996.

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