Epidemiology and Geography by Souris Marc;

Author:Souris, Marc;
Language: eng
Format: epub
ISBN: 9781119597438
Publisher: John Wiley & Sons, Inc.
Published: 2018-02-18T00:00:00+00:00

5.2.1.1. Absolute geographical location

The objective is to analyze the absolute global location of the studied phenomenon. The absolute global location of a spatial distribution is characterized by a synthesis object, the mean center. We are testing if the location of the mean center of the observed distribution is significantly far away from the location of the mean centers of simulated distributions. To do this, we use a global mean center, which is the mean center of the mean centers of the simulated distributions, and a standard deviational ellipse whose center is the global mean center, and which contains (100 − α)% of the simulated mean centers (α is the chosen risk of error). The null hypothesis is: “the center of the observed situation does not differ from the global center”, and the alternative hypothesis is: “the center of the observed situation differs from the global center”. H0 is rejected if the observed center is not in the global standard deviational ellipse. The test is always one-tailed.

QUESTION.– Globally, can the locations of events be considered as random?

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