Although NSSP regulations allow shellfish growing areas to be open for harvest when the estimated 90th percentile of fecal coliform concentrations is in the range of 0 to 43 MPN/100 mL as shown by Figure 3, about 97% of the estimated 90th percentile values were in the

true negative zone below the Pearl limit of 26 MPN/100 mL.

Major finding: No significant differences in BMI were found in the false negative group (range, 26.13 plus or minus 1.03) and the combined true positive and

true negative preterm labor groups combined (range, 28.04 plus or minus 3.77) (P=.32).

TN =

True Negative = Normal (negative) by both the test and reference methods

The upshot is that

true negative causal claims have as their truthmakers actual states of affairs.

CALRETININ Final diagnosis Total Benign Malignant Negative 2 30 32 Positive 18 0 18 Total 20 30 50 Sensitivity 90% Specificity 100% PPV 100% NPV 94% Accuracy 96% FN = false negative, FP = false positive, TN =

true negative, TP = true positive, PPV = positive predictive value, NPV = negative predictive value.

Sensitivity [sensitivity = true positive/(true positive + false negative)], specificity [specificity = true negative/(

true negative + false positive)], their respective 95% confidence intervals, and accuracy [accuracy = (true positive +

true negative)/(true positive + false positive + false negative +

true negative)] (27) were calculated for each laboratory and for all laboratories collectively.

The yield cutoff between the high- and low-productivity groups was set at maximum number of true positive and

true negative observations about the critical Aitchison distance using the Cate-Nelson partitioning procedure (NELSON & ANDERSON, 1984), with at least 20 observations (readjusted to 25 after the Cate-Nelson optimization) in

true negative group.

Here True positive = TP; False negative = FN; False positive = FP;

True negative = TN; Precision = p; overall probability = OP We know that

We arbitrarily chose the positive and negative direction of the alignment planes so that the correct intended subject responses were either a true positive or

true negative and the incorrect unintended subject responses were either a false positive or false negative (Table 2).

However, the percentage of

true negative results in those without prostate cancer was significantly higher than PSA or PAP testing.

Further, because gold standard assessments do not really exist in psychology or education (Cone, 1988), the prevalence of the condition will vary based on the criterion used to estimate true positives and

true negatives and the cut score applied to this measure to generate true positive and

true negative judgments.

First, whether an individual turns out to be a true positive or

true negative depends heavily upon how behavior on parole is measured.