I am looking for an implementation of the linear ballistic accumulator model or Ratcliff's diffusion model (e.g. in R, MATLAB, or Python).
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5 Answers
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Here are a few options. I have not tried them yet personally.
As mentioned below, the rtdists package in R is able to fit both LBA and diffusion models.
Other Options
LBA
Scott Brown has a copy of Donkin et al (2009) on his web page with some code in R, Excel, and WinBUGS for fitting the LBA model:
- http://www.newcl.org/publications/DonkinAverellEtAl2009BRM.pdf
- http://www.newcl.org/members/chris/fitLBA.zip
There's also the glba package on CRAN by Ingmar Visser.
Diffusion model
The Diffussion model is available as a matlab toolbox called (DMAT).
References
- Donkin, C., Averell, L., Brown, S.D., & Heathcote, A. (2009) Getting more from accuracy and response time data: Methods for fitting the Linear Ballistic Accumulator model. Behavior Research Methods, 41, 1095-1110. PDF
- Vandekerckhove, J., & Tuerlinckx, F. (2008). Diffusion model analysis with MATLAB: A DMAT primer. Behavior Research Methods, 40, 61-72. doi:10.3758/BRM.40.1.61 PDF
answered Oct 23, 2012 at 23:25
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For the diffusion model, there is also Eric-Jan Wagenmakers' "EZ-diffusion model", which you can find here.
This paper compares three different pieces of software for estimation of diffusion model parameters:
von Ravenzwaaij D., & Oberauer, K. (2009). How to use the diffusion model: Parameter recovery of three methods: EZ, fast-dm, and DMAT. Journal of Mathematical Psychology, 53 (6), 463–473. [PDF]
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The R package diffIRT (http://www.dylanmolenaar.nl/jss1265.pdf) estimates both the Q and the D diffusion models (see his website for the van der Maas et al. paper discussing the differences between these models). R code for the EZ2 approach, which is much faster if that is important for your applications, is http://raoul.socsci.uva.nl/EZ2/.
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In the subheading you also mention that you're interested in matlab / python implementations:
I've personally used DMAT in matlab at that's a nice package. However, the python based HDDM package may be one of the best around at the moment (in my opinion) and it has a good user guide.
http://ski.clps.brown.edu/hddm_docs/abstract.html
and the paper associated with the package:
Wieki et al (2013): http://journal.frontiersin.org/article/10.3389/fninf.2013.00014/full
References
- Wiecki, T. V., Sofer, I., & Frank, M. J. (2013). HDDM: hierarchical bayesian estimation of the drift-diffusion model in python. Frontiers in neuroinformatics, 7, 14. http://journal.frontiersin.org/article/10.3389/fninf.2013.00014/full
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The R package rtdists is another great option:
Provides response time distributions (density/PDF, distribution function/CDF, quantile function, and random generation): (a) Ratcliff diffusion model based on C code by Andreas and Jochen Voss and (b) linear ballistic accumulator (LBA) with different distributions underlying the drift rate.
