...
首页> 外文期刊>Environmental Science & Technology >More Than Obvious:Better Methods for Interpreting NONDETECT DATA
【24h】

More Than Obvious:Better Methods for Interpreting NONDETECT DATA

机译:比显而易见的更好:解释NONDETECT数据的更好方法

获取原文
获取原文并翻译 | 示例
           

摘要

Low-level concentrations of organic and inorganic chemicals are often reported as "nondetect" or "less-than" values.These concentrations are known only to be somewhere between zero and the laboratory's reporting level (RL).Fifteen years ago,ES&T published an article titled "Less Than Obvious" (1) that outlined methods for the statistical analysis of nondetect data.Since that time,the fields of survival analysis and reliability analysis (2,3) have continued to improve on methods for handling censored data-those observations reported only as being above or below a threshold value.For example,methods for hypothesis tests and regression for censored data are now standard features of statistics software.Decades-old methods in these two fields that were originally applied only to "greater thans" can also be applied to the "less thans" of low-level environmental concentrations.
机译:低水平的有机和无机化学品的浓度通常被报告为“未检测到”或“小于”值。已知这些浓度仅在零与实验室报告水平(RL)之间。15年前,ES&T发布了文章“比明显少”(1)概述了非检测数据的统计分析方法。自那时以来,生存分析和可靠性分析的领域(2,3)一直在改进处理删失数据的方法。观测值仅报告为高于或低于阈值。例如,用于假设检验的方法和用于审查数据的回归现在是统计软件的标准功能。这两个领域中已有数十年历史的方法,最初仅应用于“大于”也可以应用于低水平环境浓度的“小于”。

著录项

  • 来源
    《Environmental Science & Technology》 |2005年第20期|p.419A-423A|共5页
  • 作者

    Dennis R.Helsel;

  • 作者单位
  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号