ISSS608 2017-18 T1 Assign WANG RUI Investigation step3
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The next step after identifying and gathering symptoms on the persons with the disease is to systematically describe some of the key characteristics. This process, in which the outbreak is characterized by time, place, and person, is called descriptive epidemiology.
First, let's study the time pattern of epidemic outbreak. In order to find out the time when epidemic started and outbroke, key symptom terms are used as an indicator of patient. The formula below is used to extract key works from each message.
13 key terms are selected and labeled as 0 or 1 in separate columns.
For each of the key term, number of symptoms at different time is plotted as follows:
Increase in inhalation symptoms was observed on May 18, where as Gastrointestinal symptoms outbreak started one day later. Within inhalation types of symptoms, there are also three stages.
