Data tends to be typically unstructured and is represented in a very high dimensional space making it very difficult to understand, visualize and classify. This piece demystifies dimensionality reduction, which is all about representing data to draw the right inferences.

Siri, Jeannie and a multitude of apps with human monikers have replaced my dog-eared diary. As efficient and understanding as these digital assistants are (have you ever known Siri to lose her temper or show attitude?), you have to share …