rows have to be in line with observations <code>x</code> and the
number of columns must equal the mixture components <code>k</code>.</p></dd>
<dt>distribution</dt>
<dd><p>supposed distribution of mixture model components.
The value must be <code>"weibull"</code>. Other distributions have not been
implemented yet.</p></dd>
<dt>k</dt>
<dd><p>integer of mixture components, default is 2.</p></dd>
<dt>method</dt>
<dd><p>default method is <code>"EM"</code>. Other methods have not been
implemented yet.</