19 Oct 2004
CS 5244: Library Evaluation
24
Pre-Test Probability of Relevance
=
(TP+FN) / (TP+FP+FN+TN)
(in this case = prevalence)
(TP+FN) / (TP+FP+FN+TN)
(in this case = prevalence)
Specificity
=
TN / (FP+TN)
TN / (FP+TN)
Sensitivity
=
TP / (TP+FN)
=
TP / (TP+FN)
All documents =
TP+FP+FN+TN
TP+FP+FN+TN
All non-relevant
All Relevant
Negative Predictive Value
=
TN / (FN+TN)
=
TN / (FN+TN)
All with Negative Test
FN+TN
FN+TN
True Negative
(TN)
(TN)
False Negative
(FN)
(FN)
-
Positive Predictive Value
=
TP / (TP+FP)
=
TP / (TP+FP)
All with Positive Test
TP+FP
TP+FP
False Positive
(FP)
(FP)
True Positive
(TP)
(TP)
+
Test (System)
-
+
Relevant
Sensitivity,
specificity,
positive and negative predictive value
positive and negative predictive value