N is a frequency that describes the
number of individuals in the current population
(i.e., the overall number of cases considered).
An object of class
numeric of length 1.
A population of
N individuals can be split into 2 subsets
in 2 different ways:
cond.true depends on the prevalence
cond.false depends on the prevalence's complement
1 - prev.
dec.pos depends on the proportion of positive decisions
dec.neg depends on the proportion of negative decisions
1 - ppod.
The population size
N is a free parameter (independent of the
N is unknown, a suitable minimum value can be computed by
to other frequencies:
In a population of size
the following relationships hold:
N = cond.true + cond.false (by condition)
N = dec.pos + dec.neg (by decision)
N = dec.cor + dec.err (by correspondence of decision to condition)
N = hi + mi + fa + cr (by condition x decision)
Current frequency information is computed by
comp_freq and contained in a list
Consult Wikipedia: Statistical population for additional information.
is_freq verifies frequencies;
num contains basic numeric parameters;
init_num initializes basic numeric parameters;
freq contains current frequency information;
comp_freq computes current frequency information;
prob contains current probability information;
comp_prob computes current probability information.
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