posttest: Posttest Odds & Probability.

In petersenlab: A Collection of R Functions by the Petersen Lab

Posttest Odds & Probability.

Description

Estimate posttest odds and posttest probability.

Usage

posttestOdds(
  TP,
  TN,
  FP,
  FN,
  pretestProb = NULL,
  SN = NULL,
  SP = NULL,
  likelihoodRatio = NULL
)

posttestProbability(
  TP,
  TN,
  FP,
  FN,
  pretestProb = NULL,
  SN = NULL,
  SP = NULL,
  likelihoodRatio = NULL
)

Arguments

TP	Number of true positive cases.
TN	Number of true negative cases.
FP	Number of false positive cases.
FN	Number of false negative cases.
pretestProb	Pretest probability (prevalence/base rate/prior probability) of characteristic, as a number between 0 and 1.
SN	Sensitivity of the test at a given cut point, as a number between 0 and 1.
SP	Specificity of the test at a given cut point, as a number between 0 and 1.
likelihoodRatio	Likelihood ratio of the test at a given cut point.

Details

Estimates posttest odds or posttest probability.

Value

The requested posttest odds or pottest probability.

See Also

Other accuracy: accuracyAtCutoff(), accuracyAtEachCutoff(), accuracyOverall(), nomogrammer(), optimalCutoff()

Examples

posttestOdds(
  TP = 26,
  TN = 56,
  FP = 14,
  FN = 14)

posttestOdds(
  pretestProb = 0.3636364,
  SN = 0.65,
  SP = 0.80)

posttestOdds(
  pretestProb = 0.3636364,
  likelihoodRatio = 3.25)

posttestProbability(
  TP = 26,
  TN = 56,
  FP = 14,
  FN = 14)

posttestProbability(
  pretestProb = 0.3636364,
  SN = 0.65,
  SP = 0.80)

posttestProbability(
  pretestProb = 0.3636364,
  likelihoodRatio = 3.25)

petersenlab documentation built on April 4, 2025, 12:22 a.m.