3.2.1- Viral InfluxLet us consider the relationship between world-wide virus prevalence and the number of virus incidents observed in a large sample population as a function of time.
If the number of machines in the organization and the permeability
of the organizational boundary remain constant, the number of
incidents per unit time I(t) is proportional to the number
of infected machines in the world (at least the part of the
world with which the organization comes in contact). However,
all that a central reporting agency can record is
If the
where Q(t) is the probability density for the incident duration to be t.
To a rough approximation,
The assumption of constant
|
,
the number of incidents observed per unit time.
and
are reasonably constant with time,
the observed incident rate
is related to the actual incident rate I(t) via
, where Q is
the average incident duration. In other
words,