Description Usage Format Details References See Also Examples
cond.true
is a frequency that describes the
number of individuals in the current population N
for which the condition is TRUE
(i.e., actually true cases).
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An object of class numeric
of length 1.
Key relationships:
to probabilities:
The frequency of cond.true
individuals depends on the population size N
and
the condition's prevalence prev
and is split further into two subsets of
hi
by the sensitivity sens
and
mi
by the miss rate mirt
.
Perspectives:
by condition:
The frequency cond.true
is determined by the population size N
times the prevalence prev
:
cond.true = N x prev
by decision:
a. The frequency hi
is determined by cond.true
times the sensitivity sens
(aka. hit rate HR
):
hi = cond.true x sens
b. The frequency mi
is determined by cond.true
times the miss rate mirt = (1 - sens)
:
mi = cond.true x mirt = cond.true x (1 - sens)
to other frequencies:
In a population of size N
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
freq
.
Consult Wikipedia: Confusion matrix 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.
Other frequencies: N
,
cond.false
, cr
,
dec.cor
, dec.err
,
dec.neg
, dec.pos
,
fa
, hi
, mi
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