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An example of a matrix in which the columns and rows represent the characteristics of the subpopulations (age group) and individual cells are estimates of probabilities of contact or contact rates between each subpopulation sufficient for transmission to occur (β)
| 0–4 yr | 5–18 yr | 19–64 yr | 65 + yr | |
|---|---|---|---|---|
| 0–4 yr | β1 | β2 | β3 | β4 |
| 5–18 yr | β5 | β6 | β7 | |
| 19–64 yr | β8 | β9 | ||
| 65 + yr | β10 |
