The French National Program on Nutrition and Health has defined two specific objectives targeting older persons: (i) to improve their status in calcium and vitamin D and (ii) to prevent undernutrition.
Following [8], consider an indicator random variable X ij which is 1 if persons i and j (of total k) have the same birthday and 0 otherwise.
If (hbox {y}_{mathrm{i}}) and (hbox {y}_{mathrm{j}}) are taxable incomes of two persons i and j, and (hbox {R}_{mathrm{i}}) and (hbox {R}_{mathrm{j}}) are the taxes to be paid by i resp.
Second, after these connections are determined, we assign a distinct transmissibility, T ij, for each pair of connected persons i and j, that depends on the nature of their contact.
If a person i is infectious for a period of τ days, the transmissibility of infection between persons i and j, T ij, is 1 – (1 – p ij) τ i, where p ij is the probability of transmission (per day).
The attack rate in the study participants was 87% (26 of 30 persons), i. e., the ratio of ill to non-ill persons in the retrospective cohort study was not substantially distorted.
