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ream
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install.packages("ream")
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library("remotes")
install_github("cran/ream")
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library("remotes")
install_version("ream", "1.0-5")
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library("ream")
Maintained by
Raphael Hartmann
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All associated links for this package
10.32614/CRAN.package.ream . https://github.com/RaphaelHartmann/ream/issues . https://github.com/RaphaelHartmann/ream . ream results . ream.pdf . ream: guideline . ream_1.0-5.tar.gz . ream_1.0-5.zip . ream_1.0-5.zip . ream_1.0-5.zip . ream_1.0-5.tgz . ream_1.0-5.tgz . ream_1.0-5.tgz . ream_1.0-5.tgz . ream_1.0-5.tgz . ream_1.0-5.tgz . ream archive . https://CRAN.R-project.org/package=ream .
First Published: 2024-09-10
Latest Update: 2024-09-20
Description:
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.
How to cite:
Raphael Hartmann (2024). ream: Density, Distribution, and Sampling Functions for Evidence Accumulation Models. R package version 1.0-5, https://cran.r-project.org/web/packages/ream. Accessed 07 Apr. 2025.
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