dRiftDM

dRiftDM

... is an R package designed to help you easily apply drift-diffusion models (DDMs). It was developed based on our own experience with the typical requirements of estimating such models and is therefore ideally suited for scientists interested in psychological questions. In contrast to other “ready-to-use” software packages, such as the well-known and widely used fast-dm, the package also enables the estimation of so-called non-stationary DDMs. Such non-stationary DDMs are characterized by time-dependent parameters, such as a time-dependent drift rate.

The package offers essential tools for standard analyses and already contains various ready-made models. These include the standard diffusion model by Ratcliff (1978), the Diffusion Model of Conflict Tasks by Ulrich et al. (2015) and the Shrinking Spotlight Model by White et al. (2011). Users can also flexibly create their own models or adapt existing models. The figure below shows the qualitative model fit of the Diffusion Model for Conflict Tasks after it has been fitted to the data of a Simon task.

Further information on dRiftDM can be found here.