[Solr Wiki] Update of "StatsComponent" by ryan

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The following page has been changed by ryan:
http://wiki.apache.org/solr/StatsComponent

New page:
= StatsComponent =

<!> ["Solr1.4"]

The stats component returns simple statistics for numeric fields within the !DocSet.

With the example data loaded:
http://localhost:8983/solr/select?q=*:*&stats=true&stats.field=price&stats.field=popularity&stats.twopass=true&rows=0&indent=true

{{{
<lst name="stats">
 <lst name="stats_fields">
  <lst name="price">
    <double name="min">0.0</double>
    <double name="max">2199.0</double>
    <double name="sum">5251.2699999999995</double>
    <long name="count">15</long>
    <long name="missing">11</long>
    <double name="sumOfSquares">6038619.160300001</double>
    <double name="mean">350.08466666666664</double>
    <double name="median">11.5</double>
    <double name="stddev">547.737557906113</double>
  </lst>
  <lst name="popularity">
    <double name="min">0.0</double>
    <double name="max">10.0</double>
    <double name="sum">90.0</double>
    <long name="count">26</long>
    <long name="missing">0</long>
    <double name="sumOfSquares">628.0</double>
    <double name="mean">3.4615384615384617</double>
    <double name="median">7.0</double>
    <double name="stddev">3.5578731762756157</double>
  </lst>
 </lst>
</lst>
}}}