ntpp.simple_screenr | R Documentation |
ntpp.simple_screenr
computes the ratio of the total number of
tests performed per positive test result and the anticipated proportion of the
untested (those screened out of testing) who would actually test positive.
## S3 method for class 'simple_screenr' ntpp(object, ..., prev = NULL)
object |
a |
... |
optional arguments to |
prev |
an optional positive proportion for the test outcome; if missing
the prevalence is obtained from |
The anticipated number of tests required to detect a single positive nntp is given by
nntp = (SeP + (1 - Sp)(1 - P)) / SeP
where Se is sensitivity, P is prevalence and Sp is specificity. The anticipated positive proportion among those screened out is given by
Puntested = ((1 - Se)P) / ((1 - Se)P + Sp (1 - P))
ntpp.simple_screenr
returns data frame containing the following
columns:
sensitivity
The sensitivity (proportion) of the screener.
specificity
The specificity (proportion) of the screener.
ntpp
the number of tests required to discover a single positive test result.
prev_untested
The positive proportion of the test condition among those who are screened out of testing.
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