Search Results for author: Joseph D. Ramsey

Found 9 papers, 3 papers with code

Py-Tetrad and RPy-Tetrad: A New Python Interface with R Support for Tetrad Causal Search

2 code implementations13 Aug 2023 Joseph D. Ramsey, Bryan Andrews

With the addition of some simple tools and the provision of working examples for both Python and R, using JPype and Reticulate to interface Python and R with Tetrad is straightforward and intuitive.

Improving Accuracy of Permutation DAG Search using Best Order Score Search

1 code implementation17 Aug 2021 Joseph D. Ramsey

The Sparsest Permutation (SP) algorithm is accurate but limited to about 9 variables in practice; the Greedy Sparest Permutation (GSP) algorithm is faster but less weak theoretically.

Identification of Effective Connectivity Subregions

no code implementations8 Aug 2019 Ruben Sanchez-Romero, Joseph D. Ramsey, Kun Zhang, Clark Glymour

These algorithms allow for identification of subregions of voxels driving the connectivity between regions of interest, recovering valuable anatomical and functional information that is lost when ROIs are aggregated.

Hippocampus Time Series +1

A Comparison of Public Causal Search Packages on Linear, Gaussian Data with No Latent Variables

no code implementations13 Sep 2017 Joseph D. Ramsey, Bryan Andrews

We compare Tetrad (Java) algorithms to the other public software packages BNT (Bayes Net Toolbox, Matlab), pcalg (R), bnlearn (R) on the \vanilla" task of recovering DAG structure to the extent possible from data generated recursively from linear, Gaussian structure equation models (SEMs) with no latent variables, for random graphs, with no additional knowledge of variable order or adjacency structure, and without additional specification of intervention information.

Mixed Graphical Models for Causal Analysis of Multi-modal Variables

1 code implementation9 Apr 2017 Andrew J Sedgewick, Joseph D. Ramsey, Peter Spirtes, Clark Glymour, Panayiotis V. Benos

Graphical causal models are an important tool for knowledge discovery because they can represent both the causal relations between variables and the multivariate probability distributions over the data.

feature selection Graph Learning

algcomparison: Comparing the Performance of Graphical Structure Learning Algorithms with TETRAD

no code implementations27 Jul 2016 Joseph D. Ramsey, Daniel Malinsky, Kevin V. Bui

In this report we describe a tool for comparing the performance of graphical causal structure learning algorithms implemented in the TETRAD freeware suite of causal analysis methods.

Scaling up Greedy Causal Search for Continuous Variables

no code implementations28 Jul 2015 Joseph D. Ramsey

As standardly implemented in R or the Tetrad program, causal search algorithms used most widely or effectively by scientists have severe dimensionality constraints that make them inappropriate for big data problems without sacrificing accuracy.

Effects of Nonparanormal Transform on PC and GES Search Accuracies

no code implementations7 May 2015 Joseph D. Ramsey

Liu, et al., 2009 developed a transformation of a class of non-Gaussian univariate distributions into Gaussian distributions.

A Scalable Conditional Independence Test for Nonlinear, Non-Gaussian Data

no code implementations20 Jan 2014 Joseph D. Ramsey

Among these, perhaps the most efficient has been KCI (Kernel Conditional Independence, Zhang et al. (2011)), with computational requirements that grow effectively at least as O(N3), placing it out of range of large sample size analysis, and restricting its applicability to high dimensional data sets.

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