p>whether to use REML estimation rather than maximum likelihood.</p></dd>


<dt>start</dt>
<dd><p>starting values, expressed as a list with possible components <code>beta</code>, <code>betazi</code>, <code>betadisp</code> (fixed-effect parameters for conditional, zero-inflation, dispersion models); <code>b</code>, <code>bzi</code> (conditional modes for conditional and zero-inflation models); <code>theta</code>, <code>thetazi</code> (random-effect parameters, on the standard deviation/Cholesky scale, for co