Description Usage Format Details References See Also Examples
N
is a frequency that describes the
number of individuals in the current population
(i.e., the overall number of cases considered).
1 |
An object of class numeric
of length 1.
Key relationships:
to probabilities:
A population of N
individuals can be split into 2 subsets
in 2 different ways:
by condition:
The frequency cond.true
depends on the prevalence prev
and
the frequency cond.false
depends on the prevalence's complement 1 - prev
.
by decision:
The frequency dec.pos
depends on the proportion of positive decisions ppod
and
the frequency dec.neg
depends on the proportion of negative decisions 1 - ppod
.
The population size N
is a free parameter (independent of the
essential probabilities prev
, sens
, and spec
).
If N
is unknown, a suitable minimum value can be computed by comp_min_N
.
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: 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.
Other frequencies: cond.false
,
cond.true
, cr
,
dec.cor
, dec.err
,
dec.neg
, dec.pos
,
fa
, hi
, mi
1 2 3 |
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.