西部农村产权抵押信贷中农户分类实例研究     

孙一清  陈漳顺  李启璐  石行  邱丽萍  吴养会 《安徽农业科学》2017,45(29)

基于陕西及宁夏部分地区农户关于产权抵押贷款的有关调研数据,以所在地区、年龄、家庭年收入等6个因素作为自变量,以农户产权抵押贷款需求为因变量,利用R语言构建决策树的农户产权抵押贷款信用评估模型,为相关农村金融机构提供金融政策方面的支持。研究结果表明:对于具有不同特征的农户,其贷款意愿呈现出一定的差异性。最终,除耕地面积变量外其余5个变量被引入决策树模型进行分析。通过检验和改进后的模型具有一定的分类正确性及准确性,对于农村金融机构在制定相应的金融政策及实际贷款风险控制过程中能起到一定的参考作用。  相似文献   

Sensitivity and Specificity of Plasma ALT,ALP, and Bile Acids for Hepatitis in Labrador Retrievers          下载免费PDF全文

K. Dirksen  I.A. Burgener  J. Rothuizen  T.S.G.A.M van den Ingh  L.C. Penning  B. Spee  H. Fieten 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2017,31(4):1017-1027

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RECEIVER OPERATING CHARACTERISTIC CURVE ANALYSIS OF THE UTILITY OF THORACIC RADIOGRAPHS FOR THE DIAGNOSIS OF FELINE CARDIAC DISEASE     

JEFFREY A. WORTMAN  VMD  PHD    PEARL CHANG-WINTERKORN  DVM  DAVID H. KNIGHT  VMD    GILBERT J. JACOBS  DVM 《Veterinary radiology & ultrasound》1987,28(4):121-126

The results of a retrospective study in which 90 sets of feline thoracic radiographs were examined by six readers were evaluated with the aid of receiver operating characteristic (ROC) curve analysis. There were 51 sets of radiographs of 45 normal cats and 39 sets of radiographs of 33 cats with cardiac disease. The readers were asked to classify each set of radiographs as normal or abnormal, with respect to cardiac disease, into one of five diagnostic cholces that reflected reader confidence. The method of generating an ROC curve is discussed. There was no significant difference in the accuracy of interpretation between the five experienced readers. The mean accuracy of this group was 91%. However, inspection of the individual ROC curves demonstrated a fundamental difference in underlying reader bias (i.e., over-or underreading). As expected, the experienced readers were statistically more accurate than an inexperienced reader. ROC curve methodology has potential applications in veterinary medicine not only for assessing observer performance and reader bias, but also for comparing tests and in clinical decision making.  相似文献   

NAR神经网络的应用与检验——以城市居民生活需水定额为例     

李析男  王宁  梅亚东  赵先进 《灌溉排水学报》2017,36(11)

NAR神经网络具有反馈和记忆功能,其在时间序列的建模仿真方面具有显著优点。以城市居民生活需水定额为例,采用NAR神经网络建立了贵州省城市居民生活需水定额的时间序列模型,通过试验法、留一法交叉检验讨论了模型相关输入参数的计算与选取,通过相关系数、Nash效率系数、LBQ检验、ROC曲线方法检验了模型的性能和预测结果的精度,进而对贵州省城市居民生活需水定额变化趋势进行了预测。结果表明,(1)NAR模型性能良好并具有较高的预测精度,NAR神经网络的相关系数r、Nash效率系数分别达到0.97、0.87,LBQ检验得出预测结果误差不存在自相关性,采用预测结果绘制ROC曲线,其AUC值达到0.938(处于水平1,有较高准确性);(2)需水定额合理性评价中,预测2020年、2030年需水定额分别为137.72 L/(人·d)、132.94 L/(人·d),满足《室外给水设计规范》(GB50013—2006)的要求,具有较好的适用性。  相似文献   

奶牛维生素E缺乏症的血液病理学及其预警     

于泓漪  张翠羽  钱伟东  赵畅  张洪友  夏成 《中国兽医学报》2021,(1):124-128

近年来高产奶牛围产期维生素E(VE)缺乏较为普遍,但这一问题在牛场最易被忽视.为此,本试验在某一大型集约化牛场,选取VE缺乏组奶牛40头,健康组奶牛40头,对试验奶牛的抗氧化、肝功、能量代谢、矿物元素和其他维生素指标进行显著性分析、Pearson相关性分析和回归分析及ROC分析.结果显示:与健康组相比,VE缺乏组血浆中...  相似文献