Error Handling etc">policy section</a>.
    </p>
<p>
      An example is at the Policy tutorial in <a class="link" href="pol_tutorial/changing_policy_defaults.html" title="Changing the Policy Defaults">Changing
      the Policy Defaults</a>.
    </p>
<p>
      Full source code of this typical example of passing a 'bad' argument (negative
      degrees of freedom) to Student's t distribution is <a class="link" href="stat_tut/weg/error_eg.html" title="Error Handling Example">in
      the error handling exampl