They then mapped out the correlations between the various symptoms, creating a network. An increasingly standard tool in network theory these days is cluster detection–the ability to spot parts of a network that are more strongly linked together than others.

~ http://www.technologyreview.com/view/512986/network-theory-approach-reveals-altitude-sickness-to-be-two-different-diseases/

Acute mountain sickness (AMS) is a common problem among visitors at high altitude, and may progress to life-threatening pulmonary and cerebral oedema in a minority of cases. … These results challenge the accepted paradigm that AMS is a single disease process and describe at least two distinct syndromes following acute ascent to high altitude. This approach to analysing symptom patterns has potential utility in other clinical syndromes.

~ http://arxiv.org/abs/1303.6525

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