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I have merged the DDM implementation from the https://github.com/t-alfers/WienerDiffusionModel.jl repo (thanks @t-alfers). I chose to use the response time implementation that utilizes the negative-RT solution. The negative RTs indicate a lower-bound response. This approach is more straightforward and, importantly, significantly reduces the probability of coding the model incorrectly. It follows the original JAGS implementation (see Vandekerckhove 2014) where the lower-bound hits as negative reaction times were used as a cost-effective way of encoding what essentially is a bivariate distribution (strictly positive RT and binary response). Refer to this old thread for discussion. It may also help resolve some issues we were experiencing with Turing.jl compatibility.