leerho commented on issue #7161: Indicating time trends in topN results
URL: 
https://github.com/apache/incubator-druid/issues/7161#issuecomment-485600214
 
 
   @gianm 
   Yes, the initial docs are the Javadocs, (duplicated on the website) I am 
working on more extensive docs including some accuracy characterization 
studies, which are more complicated to do.  Meanwhile:  See [FdtSketch 
Javadoc](https://github.com/DataSketches/sketches-core/blob/master/src/main/java/com/yahoo/sketches/fdt/FdtSketch.java).
  
   
   Also see [unit 
tests](https://github.com/DataSketches/sketches-core/blob/master/src/test/java/com/yahoo/sketches/fdt/FdtSketchTest.java)
 for some real simple examples to get started.  But don't use the 
FdtSketch(lgK) to configure, use the FdtSketch(threshold, rse) to configure the 
sketch. You can start out by trying numbers like FdtSketch(0.01, 0.05), which 
means you will capture distincts that are greater than at least 10% of the 
overall population of distincts where the Relative Standard Error (at 68% 
confidence) will be 5% or better. 
   
   
   
   

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