Internal function used with postive d' models
cond.alphaD(wD, muD, alphaD, betaD, thetaD, alphaR, etaA, phiA, sub, item, lag, sig2alpha)
~~Describe wD here~~
~~Describe muD here~~
~~Describe alphaD here~~
~~Describe betaD here~~
~~Describe thetaD here~~
~~Describe alphaR here~~
~~Describe etaA here~~
~~Describe phiA here~~
~~Describe sub here~~
~~Describe item here~~
~~Describe lag here~~
~~Describe sig2alpha here~~