l><dt>x</dt>
<dd><p>a numeric vector which consists of lifetime data. Lifetime
data could be every characteristic influencing the reliability of a product,
e.g. operating time (days/months in service), mileage (km, miles), load
cycles.</p></dd>
<dt>status</dt>
<dd><p>a vector of binary data (0 or 1) indicating whether unit <em>i</em>
is a right censored observation (= 0) or a failure (= 1).</p></dd>
<dt>post</dt>
<dd><p>a numeric matrix specifying initial a-posteriori probabilities.
The number of 