Frequency Estimation in Streams
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# Frequency Estimation in Streams ## Count-Min Sketch vs Count Sketch Property Count-Min Count Estimate bias Overestimates (never underestimates) Unbiased Space $O(\frac{1}{\epsilon} \log \frac{1}{\delta})$ $O(\frac{1}{\epsilon^2} \log \frac{1}{\delta})$ Update time $O(\log \frac{1}{\delta})$ $O(\log \frac{1}{\delta...
Frequency Estimation in Streams
Count-Min Sketch vs Count Sketch
| Property | Count-Min | Count |
|---|---|---|
| Estimate bias | Overestimates (never underestimates) | Unbiased |
| Space | ||
| Update time | ||
| Error guarantee | $ |
Count-Min Sketch: Guarantee
For any query , with probability :
Where is the sum of all frequencies, is error parameter, is failure probability.
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