Fits standard and random effects latent class models. The single level random effects model is described in Qu et al &lt;<a href="https://doi.org/10.2307%2F2533043" target="_top">doi:10.2307/2533043</a>&gt; and the two level random effects model in Beath and Heller &lt;<a href="https://doi.org/10.1177%2F1471082X0800900302" target="_top">doi:10.1177/1471082X0800900302</a>&gt;. Examples are given for their use in diagnostic testing.