Posttest Odds & Probability.

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.

Value

The requested posttest odds or pottest probability.

Details

Estimates posttest odds or posttest probability.

See also

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

Examples

posttestOdds(
  TP = 26,
  TN = 56,
  FP = 14,
  FN = 14)
#> [1] 1.857143

posttestOdds(
  pretestProb = 0.3636364,
  SN = 0.65,
  SP = 0.80)
#> [1] 1.857143

posttestOdds(
  pretestProb = 0.3636364,
  likelihoodRatio = 3.25)
#> [1] 1.857143

posttestProbability(
  TP = 26,
  TN = 56,
  FP = 14,
  FN = 14)
#> [1] 0.65

posttestProbability(
  pretestProb = 0.3636364,
  SN = 0.65,
  SP = 0.80)
#> [1] 0.65

posttestProbability(
  pretestProb = 0.3636364,
  likelihoodRatio = 3.25)
#> [1] 0.65