Programming language: Go
License: MIT License
Latest version: v1.0.0

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gohistogram - Histograms in Go

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This package provides Streaming Approximate Histograms for efficient quantile approximations.

The histograms in this package are based on the algorithms found in Ben-Haim & Yom-Tov's A Streaming Parallel Decision Tree Algorithm (PDF). Histogram bins do not have a preset size. As values stream into the histogram, bins are dynamically added and merged.

Another implementation can be found in the Apache Hive project (see NumericHistogram).

An example:


The accurate method of calculating quantiles (like percentiles) requires data to be sorted. Streaming histograms make it possible to approximate quantiles without sorting (or even individually storing) values.

NumericHistogram is the more basic implementation of a streaming histogram. WeightedHistogram implements bin values as exponentially-weighted moving averages.

A maximum bin size is passed as an argument to the constructor methods. A larger bin size yields more accurate approximations at the cost of increased memory utilization and performance.

A picture of kittens:

stack of kittens

Getting started

Using in your own code

$ go get github.com/VividCortex/gohistogram
import "github.com/VividCortex/gohistogram"

Running tests and making modifications

Get the code into your workspace:

$ cd $GOPATH
$ git clone [email protected]:VividCortex/gohistogram.git ./src/github.com/VividCortex/gohistogram

You can run the tests now:

$ cd src/github.com/VividCortex/gohistogram
$ go test .

API Documentation

Full source documentation can be found here.


We only accept pull requests for minor fixes or improvements. This includes:

  • Small bug fixes
  • Typos
  • Documentation or comments

Please open issues to discuss new features. Pull requests for new features will be rejected, so we recommend forking the repository and making changes in your fork for your use case.


Copyright (c) 2013 VividCortex

Released under MIT License. Check LICENSE file for details.

*Note that all licence references and agreements mentioned in the gohistogram README section above are relevant to that project's source code only.