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| <h1 title="Package" class="title">Package com.yahoo.sketches.frequencies</h1> |
| <div class="docSummary"> |
| <div class="block">This package is dedicated to streaming algorithms that enable estimation of the |
| frequency of occurence of items in a weighted multiset stream of items.</div> |
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| <p>See: <a href="#package.description">Description</a></p> |
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| <th class="colFirst" scope="col">Class</th> |
| <th class="colLast" scope="col">Description</th> |
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| <td class="colFirst"><a href="../../../../com/yahoo/sketches/frequencies/ItemsSketch.html" title="class in com.yahoo.sketches.frequencies">ItemsSketch</a><T></td> |
| <td class="colLast"> |
| <div class="block">This sketch is useful for tracking approximate frequencies of items of type <i><T></i> |
| with optional associated counts (<i><T></i> item, <i>long</i> count) that are members of a |
| multiset of such items.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../com/yahoo/sketches/frequencies/ItemsSketch.Row.html" title="class in com.yahoo.sketches.frequencies">ItemsSketch.Row</a><T></td> |
| <td class="colLast"> |
| <div class="block">Row class that defines the return values from a getFrequentItems query.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../com/yahoo/sketches/frequencies/LongsSketch.html" title="class in com.yahoo.sketches.frequencies">LongsSketch</a></td> |
| <td class="colLast"> |
| <div class="block">This sketch is useful for tracking approximate frequencies of <i>long</i> items with optional |
| associated counts (<i>long</i> item, <i>long</i> count) that are members of a multiset of |
| such items.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><a href="../../../../com/yahoo/sketches/frequencies/LongsSketch.Row.html" title="class in com.yahoo.sketches.frequencies">LongsSketch.Row</a></td> |
| <td class="colLast"> |
| <div class="block">Row class that defines the return values from a getFrequentItems query.</div> |
| </td> |
| </tr> |
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| <th class="colFirst" scope="col">Enum</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tbody> |
| <tr class="altColor"> |
| <td class="colFirst"><a href="../../../../com/yahoo/sketches/frequencies/ErrorType.html" title="enum in com.yahoo.sketches.frequencies">ErrorType</a></td> |
| <td class="colLast"> |
| <div class="block">Specifies one of two types of error regions of the statistical classification Confusion Matrix |
| that can be excluded from a returned sample of Frequent Items.</div> |
| </td> |
| </tr> |
| </tbody> |
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| <h2 title="Package com.yahoo.sketches.frequencies Description">Package com.yahoo.sketches.frequencies Description</h2> |
| <div class="block"><p>This package is dedicated to streaming algorithms that enable estimation of the |
| frequency of occurence of items in a weighted multiset stream of items. |
| If the frequency distribution of items is sufficiently skewed, these algorithms are very |
| useful in identifying the "Heavy Hitters" that occured most frequently in the stream. |
| The accuracy of the estimation of the frequency of an item has well understood error |
| bounds that can be returned by the sketch.</p> |
| |
| <p>These sketches are mergable and can be serialized and deserialized to/from a compact |
| form.</p></div> |
| <dl> |
| <dt><span class="simpleTagLabel">Author:</span></dt> |
| <dd>Lee Rhodes</dd> |
| </dl> |
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