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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