contact_rate¶
Syntax¶
place <place-name> {
contact_rate = <number>
contact_rate_for_<condition_name> = <number>
}
network <network-name> {
contact_rate = <number>
contact_rate_for_<condition_name> = <number>
}
Description¶
Network and place property that sets the hourly rate at which agents contact each other in a given mixing group.
One of two contact modes in mixing groups; the other is
contact_prob. In contact_rate, each transmissible
agent has a fixed number of contacts with other agents within any given hour
that the mixing group is in operation. In this mode, the total number of
potential transmission contacts for a given condition in a mixing group during
its open hours on a given day is given by the formula:
contacts = (hourly contact rate of group) * (number of transmissible agents) *
(transmissibility of the condition) * (duration of the meeting in the group)
To select transmission by contact_rate, the definition of the Place or Network type includes the following properties:
place <place-name> {
contact_rate = <number>
contact_rate_for_<condition_name> = <number>
}
network <network-name> {
contact_rate = <number>
contact_rate_for_<condition_name> = <number>
}
The contact_rate property specifies the contact rate per hour for all
conditions.
If the contact_rate_for_<condition_name> property is present, it overrides
the first property for the named condition.
The conversion from contact_rate to contact_prob for an equal number of
contacts is:
contact_prob = contact_rate / (number of members of the place - 1)
The group agent for individual mixing groups can change the effective contact rate using the adjust_contacts action.
Examples¶
The contact rate of a places such as households can be set at the start of the simulation with: