ROC curve


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re·ceiv·er op·er·at·ing char·ac·ter·is·tic curve

1. a plot of percentage of true positive results versus percentage of false positive results, usually in a trial of a diagnostic test.
2. a graphic means of assessing the ability of a screening test to discriminate between healthy and diseased people.
Synonym(s): ROC curve

ROC curve

Receiver operating characteristic curve. A graphic depiction of the relationship between the true positive ratio (sensitivity) and false positive ratio (1) specificity as a function of the cut-off level of a disease or condition marker.

curve

(kurv) [L. curvus, bent, crooked]
A bend, chart, or graph.

bell curve

Normal distribution.

curve of Carus

See: curve of Carus

characteristic curve

Sensitometric curve.

dental curve

Curve of Spee.

D log E curve

Sensitometric curve.

dose response curve

A graph charting the effect of a specific dose of drug, chemical, or ionizing radiation.

dye-dilution curve

A graph of the disappearance rate of a known amount of injected dye from the circulation; used to measure cardiac function.

epidemic curve

A chart or graph in which the number of new cases of an illness is plotted over time.

Gaussian curve

Normal distribution.

growth curve

A graph of heights and weights, head circumference, and body mass index of infants and children of various ages. A line connecting the data points produces the curve. Usually the changes in height and weight are shown on the same chart. Growth charts are specific for age and gender.

learning curve

The effect of learning or practice on the performance of an intellectual or physical task. The term describes the acquisition of competence with experience, time, and training.

normal curve

Normal distribution.

receiver operating curve

Abbreviation: ROC curve
A plot of the fraction of true positives test results versus the fraction of false positive test results; the sensitivity of a test versus (1-the test specificity).
Synonym: receiver operating characteristic

sensitometric curve

In radiographic film analysis, the curve derived by graphing the exposure to the film versus the film density. Analysis yields information about the contrast, speed, latitude, and maximum and minimum densities of the film or film-screen system. Digital radiography systems exhibit linear curves.
Synonym: characteristic curve; D log E curve; Hurter and Driffield curve

curve of Spee

See: curve of Spee

Stephan curve

See: Stephan curve

survival curve

In radiobiology, a dose response curve.

time-temperature cooling curve

The mathematical relation that plots the physical and chemical behaviors of dental (and other) materials as their temperature decreases over time.

receiver operating curve

Abbreviation: ROC curve
A plot of the fraction of true positives test results versus the fraction of false positive test results; the sensitivity of a test versus (1-the test specificity).
Synonym: receiver operating characteristic
See also: curve

ROC curve

acronym for receiver operating characteristic curve. A graphical method of assessing the characteristic of a diagnostic test.
References in periodicals archive ?
ROC curves showed different ideal cutoff values for each population, probably reflecting the differences in the oral intake and thus urinary parameters.
9 Vesicular nuclei (d) Multiple nucleoli (d) Commet cells (d) Signet ring cells (d) Apocrine cells (d) (a) Chi-square test (if necessary Fisher exact test) (b) PPV: Positive predictive value, NPV: Negative predictive value (c) "Malignancy (Invasive and Insitu types)" in pathology report of biopsy including Ductal and Lubular carcinomas (d) No positive results seen Table 4: Diagnostic accuracies in different parts of ROC curve of FNA score in screening of malignancy of breast masses (open biopsy considered as Gold standard).
The ROC graph is applied in the area under the ROC curve, called AUC, which is calculated as the proportion of the area below the ROC relative to the total area of the unit square.
On the other hand ROC curves can testify to the global efficiency of a model at all operating points.
Any point P on an ROC curve has two coordinates FAR and TAR and is associated with a threshold through two distributions of genuine scores and impostor scores.
In the case of the ISR ranking using SV and WV measurements, a perfect ROC curve corresponds to a configuration where all relevant ISR are at the beginning of the list and all irrelevant syntactic relations at the end.
The results of TC/HDL-C ratio, TG/HDL-C ratio, non-HDL-C, WC, TG, and TC ROC curve analysis showed that each marker is a significant discriminator for HOMA-IR.
ROC curves were calculated across all possible death factors.
The area under the ROC curve is commonly used as a summary measure of diagnostic accuracy.
The ROC curve is a visual representation of the relationship between the true positive rate (sensitivity) and the false-positive rate (100% minus specificity; specificity is the true negative rate, see Figure 1).