ily</a></code> object specifying the type of the repeatedly measured response
    variable, e.g., <code><a href="https://rdrr.io/r/stats/family.html" class="external-link">binomial()</a></code> or <code><a href="https://rdrr.io/r/stats/family.html" class="external-link">poisson()</a></code>. The function also allows for
    user-defined family objects, but with specific extra components; see the example
    is <code><a href="negative_binomial.html">negative.binomial</a></code> for more details. Contrary to 