Conditional posterior for participant effects on normal mean where the mean is restricted to be positive.
ld.alpha(x, mu, alpha, beta, theta, cond, sub, item, lag, sig2alpha, sigma2)
~~Describe x here~~
~~Describe mu here~~
~~Describe alpha here~~
~~Describe beta here~~
~~Describe theta here~~
~~Describe cond here~~
~~Describe sub here~~
~~Describe item here~~
~~Describe lag here~~
~~Describe sig2alpha here~~
~~Describe sigma2 here~~