       n
                  ====
            1     \          _ 3
           ----    &gt;    (x - x)
              3   /       i
           n s    ====
                  i = 1
</pre>
<p>Exemplo:
</p>
<pre class="example">(%i1) load (descriptive)$
(%i2) load (numericalio)$
(%i3) s1 : read_list (file_search (&quot;pidigits.data&quot;))$
(%i4) skewness (s1), numer;
(%o4)                  .009196180476450306
(%i5) s2 : read_matrix (file_search (&quot;wind.data&quot;))$
(%i6) skewness (s2);
(%o6) [.15805090200009