Likelihood Ratio of Negative from Raw Data

 

Input
 

True Pos		# index none number points score
False Pos		# index none number points score
True Neg		# index none number points score
False Neg		# index none number points score

 

Results
 

Sensitivity		% fraction ratio
Specificity		% fraction ratio
LR Neg		% fraction ratio
Decimal Precision   0 1 2 3

 

 
Equations used
 

Sensitivity = TruePos / (TruePos + FalseNeg)

Specificity = TrueNeg / (TrueNeg + FalsePos)

LRNeg = (1-Sensitivity) / Specificity

 

 

References

1. Perera R, Heneghan C. Making sense of diagnostic test likelihood ratios. ACP J Club. 2007 Mar-Apr;146(2):A8-9. PubMed ID: 17335149