Showing 111 of total 111 results (show query)

ropensci

concstats:Market Structure, Concentration and Inequality Measures

Based on individual market shares of all participants in a market or space, the package offers a set of different structural and concentration measures frequently - and not so frequently - used in research and in practice. Measures can be calculated in groups or individually. The calculated measure or the resulting vector in table format should help practitioners make more informed decisions. Methods used in this package are from: 1. Chang, E. J., Guerra, S. M., de Souza Penaloza, R. A. & Tabak, B. M. (2005) "Banking concentration: the Brazilian case". 2. Cobham, A. and A. Summer (2013). "Is It All About the Tails? The Palma Measure of Income Inequality". 3. Garcia Alba Idunate, P. (1994). "Un Indice de dominancia para el analisis de la estructura de los mercados". 4. Ginevicius, R. and S. Cirba (2009). "Additive measurement of market concentration" <doi:10.3846/1611-1699.2009.10.191-198>. 5. Herfindahl, O. C. (1950), "Concentration in the steel industry" (PhD thesis). 6. Hirschmann, A. O. (1945), "National power and structure of foreign trade". 7. Melnik, A., O. Shy, and R. Stenbacka (2008), "Assessing market dominance" <doi:10.1016/j.jebo.2008.03.010>. 8. Palma, J. G. (2006). "Globalizing Inequality: 'Centrifugal' and 'Centripetal' Forces at Work". 9. Shannon, C. E. (1948). "A Mathematical Theory of Communication". 10. Simpson, E. H. (1949). "Measurement of Diversity" <doi:10.1038/163688a0>.

Maintained by Andreas Schneider. Last updated 1 years ago.

business-analyticscompetitionconcentrationdiversityinequalitypackage-development

10.0 match 7 stars 5.02 score 15 scripts

olafmersmann

emoa:Evolutionary Multiobjective Optimization Algorithms

Collection of building blocks for the design and analysis of evolutionary multiobjective optimization algorithms.

Maintained by Olaf Mersmann. Last updated 6 months ago.

7.1 match 8 stars 6.02 score 51 scripts 3 dependents

lbbe-software

nlsMicrobio:Nonlinear Regression in Predictive Microbiology

Data sets and nonlinear regression models dedicated to predictive microbiology.

Maintained by Aurelie Siberchicot. Last updated 13 days ago.

7.0 match 1 stars 5.57 score 41 scripts 1 dependents

cran

drc:Analysis of Dose-Response Curves

Analysis of dose-response data is made available through a suite of flexible and versatile model fitting and after-fitting functions.

Maintained by Christian Ritz. Last updated 9 years ago.

4.0 match 8 stars 8.39 score 1.4k scripts 28 dependents

lbbe-software

nlstools:Tools for Nonlinear Regression Analysis

Several tools for assessing the quality of fit of a gaussian nonlinear model are provided.

Maintained by Aurelie Siberchicot. Last updated 13 days ago.

2.7 match 6 stars 9.42 score 528 scripts 7 dependents

jacolien

edl:Toolbox for Error-Driven Learning Simulations with Two-Layer Networks

Error-driven learning (based on the Widrow & Hoff (1960)<https://isl.stanford.edu/~widrow/papers/c1960adaptiveswitching.pdf> learning rule, and essentially the same as Rescorla-Wagner's learning equations (Rescorla & Wagner, 1972, ISBN: 0390718017), which are also at the core of Naive Discrimination Learning, (Baayen et al, 2011, <doi:10.1037/a0023851>) can be used to explain bottom-up human learning (Hoppe et al, <doi:10.31234/osf.io/py5kd>), but is also at the core of artificial neural networks applications in the form of the Delta rule. This package provides a set of functions for building small-scale simulations to investigate the dynamics of error-driven learning and it's interaction with the structure of the input. For modeling error-driven learning using the Rescorla-Wagner equations the package 'ndl' (Baayen et al, 2011, <doi:10.1037/a0023851>) is available on CRAN at <https://cran.r-project.org/package=ndl>. However, the package currently only allows tracing of a cue-outcome combination, rather than returning the learned networks. To fill this gap, we implemented a new package with a few functions that facilitate inspection of the networks for small error driven learning simulations. Note that our functions are not optimized for training large data sets (no parallel processing), as they are intended for small scale simulations and course examples. (Consider the python implementation 'pyndl' <https://pyndl.readthedocs.io/en/latest/> for that purpose.)

Maintained by Jacolien van Rij. Last updated 3 years ago.

6.5 match 2.00 score 2 scripts

cran

EcoVirtual:Simulation of Ecological Models

Computer simulations of classical ecological models as a learning resource.

Maintained by Alexandre Adalardo de Oliveira. Last updated 6 years ago.

5.8 match 1.48 score 1 dependents

junlingm

ABM:Agent Based Model Simulation Framework

A high-performance, flexible and extensible framework to develop continuous-time agent based models. Its high performance allows it to simulate millions of agents efficiently. Agents are defined by their states (arbitrary R lists). The events are handled in chronological order. This avoids the multi-event interaction problem in a time step of discrete-time simulations, and gives precise outcomes. The states are modified by provided or user-defined events. The framework provides a flexible and customizable implementation of state transitions (either spontaneous or caused by agent interactions), making the framework suitable to apply to epidemiology and ecology, e.g., to model life history stages, competition and cooperation, and disease and information spread. The agent interactions are flexible and extensible. The framework provides random mixing and network interactions, and supports multi-level mixing patterns. It can be easily extended to other interactions such as inter- and intra-households (or workplaces and schools) by subclassing an R6 class. It can be used to study the effect of age-specific, group-specific, and contact- specific intervention strategies, and complex interactions between individual behavior and population dynamics. This modeling concept can also be used in business, economical and political models. As a generic event based framework, it can be applied to many other fields. More information about the implementation and examples can be found at <https://github.com/junlingm/ABM>.

Maintained by Junling Ma. Last updated 2 months ago.

cpp

0.5 match 28 stars 4.92 score 12 scripts