POISSON REGRESSION in STATA教程，
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主要内容：
Examples of Poisson regression
Example 1.  The number of persons killed by mule or horse kicks in the Prussian army
per year. Ladislaus Bortkiewicz collected data from 20 volumes of Preussischen
Statistik.  These data were collected on 10 corps of the Prussian army in the late 1800s
over the course of 20 years.
Example 2.  The number of people in line in front of you at the grocery store.  Predictors
may include the number of items currently offered at a special discounted price and
whether a special event (e.g., a holiday, a big sporting event) is three or fewer days
away.
Example 3.  The number of awards earned by students at one high school.  Predictors
of the number of awards earned include the type of program in which the student was
enrolled (e.g., vocational, general or academic) and the score on their final exam in
math.