Q-Digest is simply a complete binary tree over the range of values, where the leaf nodes are the values themselves. It as an algorithm for computing approximate quantiles on a collection of integers. Data quantiles have many applications from robust estimation, which I'll return to in a later article, to improving database query planning. A quantile summary of the sort the q-digest algorithm generates, captures information about the cumulative density function of a random variable and as such can be used for non-parametric estimation.

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A commonly used abbreviation for Quality Assurance.

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QGIS is an open source Geographic Information Sytem, that allows you to create, edit, visualize, analyze and publish Geospatial information on Windows, Linux and Mac operating systems.

Qlik Sense is a sales management and data analytics application that gives you sales, profit and loss reports displayed in colourful and customizable charts and sheets. Qlik Sense lets you build dynamic dashboards and personalized reports for individuals in your company which in turn promote meaningful insights as well as visuals. Furthermore, Qlik Sense helps identify areas of financial crisis and potential from within your enterprise.