> (i.e., the conditional effects formula); terms can also be added or subtracted. <strong>When using <code>~.</code> as the zero-inflation formula in models where the conditional effects formula contains an offset term, the offset term will automatically be dropped</strong>. The zero-inflation model uses a logit link.</p></dd>


<dt>dispformula</dt>
<dd><p>a <em>one-sided</em> formula for dispersion containing only fixed effects: the default <code>~1</code> specifies the standard dispersion given any family