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On the biological interpretation of a definition for the parameter R₀ in periodic population models
Nicolas Bacaër1, El Hadi Ait Dads
1Institut de Recherche pour le Développement-IRD, UMI 209, Bondy, France. nicolas.bacaer@ird.fr
Abstract:
An adaptation of the definition of the basic reproduction number R (0) to time-periodic seasonal models was suggested a few years ago. However, its biological interpretation remained unclear. The present paper shows that in demography, this R (0) is the asymptotic ratio of total births in two successive generations of the family tree. In epidemiology, it is the asymptotic ratio of total infections in two successive generations of the infection tree. This result is compared with other recent work.
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Coefficient of Correlation
If you suspect a linear relationship between x and y, then r can measure how strong the linear relationship is.
What the VALUE of r tells us:
The value of r is always between –1 and +1: –1 ≤ r ≤ 1.
The size of the correlation r indicates the strength of the linear...

