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KMID : 0379919960200010001
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Journal of The Korea Socity of Health Informatics and Statistics
1996 Volume.20 No. 1 p.1 ~ p.8
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Stratification in Nonparametric ROC studies in Metastasis of Early Gastric Cancer
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Lee- Tae-Rim
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Abstract
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The ROC plot is a useful tool in the evaluation of the performance of medical tests for separating two groups and is the graph of all observed(1~specificity, sensitivity)pairs and these empirical plot can be represented by a 2×2 contingency table. The non-parametric statistic of Mann-Whitney and Kolmogorov-Smirnov can be immediately identification this plot.
This paper discuss how stratification influence in ROC analysis for early gastric cancer, details of finding nonparametric ROC area estimaes and their variance when the discriminatory variables are stratified. Those results for the classifying for metastasis in early gastric cancer are presented. The improvement of diagnosability from stratified classification model. variance reduction, the comparison of ROC area estimator are provided. The various kinds of stratififcations are tried for the simultaneous assessment of diagnostic variable against before stratification.
study inverstigated low birth weight in birth certificated data(711.129 births) during 1994. obtained from National Statistical Office of Korea.
The distribution of birth weight was 2.75 percent in low birth weight(<2.5㎏ : LBW). 90.60 percent in normal birth weight and 6.65 percent in large birth weight(4.0㎏ : LABW).
Low birth weight rate in female was higher than that of male(odds ration : 1.25). The percent of low birth weight increased with increasing birth order : percents of LBW were 2.67 percent for 1st birth order. 2.75 percent for 2nd birth(odds ratio : 1.02) and 3.52 percent for 3rd and over(odds ration : 1.33).
The percent of LBW and LABW increased with maternal age. The odds ratios for low birth weight in maternal age(reference group : 20-29 years) were 1.35 for women aged under 19 and 1.39 for women aged 30 and over. The risk for low birth weight in women age 35 and older was higher than women under 34 years(odds ration : 1.76)
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