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raphaelhartmann

ream:Density, Distribution, and Sampling Functions for Evidence Accumulation Models

Calculate the probability density functions (PDFs) for two threshold evidence accumulation models (EAMs). These are defined using the following Stochastic Differential Equation (SDE), dx(t) = v(x(t),t)*dt+D(x(t),t)*dW, where x(t) is the accumulated evidence at time t, v(x(t),t) is the drift rate, D(x(t),t) is the noise scale, and W is the standard Wiener process. The boundary conditions of this process are the upper and lower decision thresholds, represented by b_u(t) and b_l(t), respectively. Upper threshold b_u(t) > 0, while lower threshold b_l(t) < 0. The initial condition of this process x(0) = z where b_l(t) < z < b_u(t). We represent this as the relative start point w = z/(b_u(0)-b_l(0)), defined as a ratio of the initial threshold location. This package generates the PDF using the same approach as the 'python' package it is based upon, 'PyBEAM' by Murrow and Holmes (2023) <doi:10.3758/s13428-023-02162-w>. First, it converts the SDE model into the forwards Fokker-Planck equation dp(x,t)/dt = d(v(x,t)*p(x,t))/dt-0.5*d^2(D(x,t)^2*p(x,t))/dx^2, then solves this equation using the Crank-Nicolson method to determine p(x,t). Finally, it calculates the flux at the decision thresholds, f_i(t) = 0.5*d(D(x,t)^2*p(x,t))/dx evaluated at x = b_i(t), where i is the relevant decision threshold, either upper (i = u) or lower (i = l). The flux at each thresholds f_i(t) is the PDF for each threshold, specifically its PDF. We discuss further details of this approach in this package and 'PyBEAM' publications. Additionally, one can calculate the cumulative distribution functions of and sampling from the EAMs.

Maintained by Raphael Hartmann. Last updated 2 months ago.

cpp

7.1 match 2 stars 5.04 score 2 scripts

hoxo-m

githubinstall:A Helpful Way to Install R Packages Hosted on GitHub

Provides an helpful way to install packages hosted on GitHub.

Maintained by Koji Makiyama. Last updated 7 years ago.

r-language

1.6 match 49 stars 7.29 score 177 scripts

jl5000

tidyged:Handle GEDCOM Files Using Tidyverse Principles

Create and summarise family tree GEDCOM files using tidy dataframes.

Maintained by Jamie Lendrum. Last updated 3 years ago.

1.5 match 8 stars 5.96 score 23 scripts 3 dependents

ctu-bern

svn:Interface Between SVN and R

Get information on SVN repositories through R. Explore file status, commit logs etc.

Maintained by Alan Haynes. Last updated 1 years ago.

2.0 match 1.70 score 2 scripts

cran

GameTheory:Cooperative Game Theory

Implementation of a common set of punctual solutions for Cooperative Game Theory.

Maintained by Sebastian Cano-Berlanga. Last updated 2 years ago.

1.9 match 1.00 score