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  • Creator(s):
    Jonathan Hauenstein, Alan Liddell, Yi Zhang
    Description:

    Standard interior point methods in semidefinite programming track a solution path for a homotopy defined by a system of polynomial equations. By viewing this in the context of numerical algebraic geometry, we are able to employ techniques to handle various cases which can arise. Adaptive precision path tracking techniques can help navigate around ill-conditioned areas. When the optimizer is singular with respect to the first-order optimality conditions, endgames can be used to efficiently and…

    Date Created:
    2018-04-10
  • Creator(s):
    Jonathan Hauenstein
    Description:

    A common problem when analyzing models, such as a mathematical modeling of a biological process, is to determine if the unknown parameters of the model can be determined from given input-output data. Identifiable models are models such that the unknown parameters can be determined to have a finite number of values given input-output data. The total number of such values over the complex numbers is called the identifiability degree of the model. Unidentifiable models are models such that th…

    Date Created:
    2018-03-09
  • Creator(s):
    Samantha Sherman, Jonathan Hauenstein
    Description:

    Computational tools in numerical algebraic geometry can be used to numerically approximate solutions to a system of polynomial equations. If the system is well-constrained (i.e., square), Newton’s method is locally quadratically convergent near each nonsingular solution. In such cases, Smale’s alpha theory can be used to certify that a given point is in the quadratic convergence basin of some solution. This was extended to certifiably determine the reality of the corresponding sol…

    Date Created:
    2018-03-08
  • Creator(s):
    Edward Beatty
    Description:

    The Mexican patent database collects data on all patents issued in Mexico from roughly 1840 to the onset of the Mexican Revolution in 1911, totaling approximately thirteen thousand five hundred (13,500) discrete patent records. At present, this is the most comprehensive record of patents issued by Mexican governments during the nineteenth century. There is no single archival or published source that contains a comprehensive list or data on Mexican patents issued over the course of the long …

    Date Created:
    2018-01-29
  • Creator(s):
    Sunny Boyd
    Description:

    Mate choice strategies in a spatially-explicit model environment

    Giordano B. S. Ferreira1, Matthias Scheutz1, and Sunny K. Boyd2 1Department of Computer Science, Tufts University, Medford, MA 02155, USA Matthias.scheutz@tufts.edu and Giordano.Ferreira@tufts.edu 2Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556, USA Boyd.1@nd.edu (Corresponding author; phone: 574-631-5021; fax: 574-631-7413)

    Keywords: mate choice, decision-making, agent-based modeling, f…

    Date Created:
    2017-12-14
  • Creator(s):
    Eitan Tzelgov, Daniel Pemstein, Adam Glynn, Svend-Erik Skaaning, Jeffrey Staton, Allen Hicken, Michael Bernhard, John Gerring, Jan Teorell, Michael Coppedge, Kelly McMann, Megan Reif, Carl Henrik Knutsen, Yi-ting Wang, David Altman, Staffan I. Lindberg, Matthew Kroenig, M. Steven Fish
    Description:

    Data for Varieties of Democracy Project. Version 7 of these files. There is also a collection of posterior files for v.7.

    Date Created:
    2017
  • Creator(s):
    Jennifer Tank
    Description:

    This dataset contains data from 17 stream 15N-NH4 tracer addition experiments conducted globally, with data partitioned by autotrophic uptake compartments (i.e., epilithic biofilm, filamentous algae, bryophytes/macrophytes) and heterotrophic uptake compartments (i.e., leaves, small wood, and fine particles) that comprise the base of stream food webs. The dataset includes compartmental data on N biomass and uptake as well as other physiochemical variable that describe conditions in each stream.

    Date Created:
    2017-09-12
  • Creator(s):
    Jan Teorell, Matthew Kroenig, Allen Hicken, Megan Reif, M. Steven Fish, Svend-Erik Skaaning, Adam Glynn, Carl Henrik Knutsen, Kelly McMann, Daniel Pemstein, David Altman, Michael Bernhard, Michael Coppedge, John Gerring, Jeffrey Staton, Eitan Tzelgov, Staffan I. Lindberg, Yi-ting Wang
    Description:

    Posterior data of Higher Level Indices for Varieties of Democracy v.7. The code book and description of the variables can be found in the main item for this collection.

    Date Created:
    2017
  • Creator(s):
    Megan Reif, Daniel Pemstein, Svend-Erik Skaaning, Jan Teorell, Kelly McMann, Eitan Tzelgov, Allen Hicken, Matthew Kroenig, Michael Bernhard, Michael Coppedge, M. Steven Fish, David Altman, Adam Glynn, Carl Henrik Knutsen, Jeffrey Staton, Yi-ting Wang, Staffan I. Lindberg, John Gerring
    Description:

    Posterior data of Higher Level Indices for Varieties of Democracy v.7. The code book and description of the variables can be found in the main item for this collection.

    Date Created:
    2017
  • Creator(s):
    Jeffrey Staton, John Gerring, Svend-Erik Skaaning, David Altman, Staffan I. Lindberg, M. Steven Fish, Matthew Kroenig, Kelly McMann, Adam Glynn, Michael Bernhard, Allen Hicken, Daniel Pemstein, Yi-ting Wang, Megan Reif, Jan Teorell, Carl Henrik Knutsen, Eitan Tzelgov, Michael Coppedge
    Description:

    Posterior data of Higher Level Indices for Varieties of Democracy v.7. The code book and description of the variables can be found in the main item for this collection.

    Date Created:
    2017
  • Creator(s):
    Adam Glynn, Megan Reif, Allen Hicken, Svend-Erik Skaaning, Matthew Kroenig, Jan Teorell, Staffan I. Lindberg, M. Steven Fish, Daniel Pemstein, Eitan Tzelgov, Michael Coppedge, Kelly McMann, David Altman, Jeffrey Staton, Yi-ting Wang, Carl Henrik Knutsen, John Gerring, Michael Bernhard
    Description:

    Posterior data of Higher Level Indices for Varieties of Democracy v.7. The code book and description of the variables can be found in the main item for this collection.

    Date Created:
    2017
  • Creator(s):
    Kelly McMann, Michael Bernhard, Eitan Tzelgov, Jan Teorell, Carl Henrik Knutsen, John Gerring, Adam Glynn, Matthew Kroenig, Michael Coppedge, Daniel Pemstein, Svend-Erik Skaaning, Allen Hicken, Megan Reif, Staffan I. Lindberg, Yi-ting Wang, M. Steven Fish, Jeffrey Staton, David Altman
    Description:

    Posterior data of Higher Level Indices for Varieties of Democracy v.7. The code book and description of the variables can be found in the main item for this collection.

    Date Created:
    2017