...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>ICES Journal of Marine Science >A general theory of age-length keys: combining the forward and inverse keys to estimate age composition from incomplete data
【24h】

A general theory of age-length keys: combining the forward and inverse keys to estimate age composition from incomplete data

机译：年龄长度密钥的一般理论：组合前向和反向密钥以从不完整的数据估计年龄组成

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

There are two approaches to estimating age composition from a large number of length observations and a limited number of age determinations: the forward and the inverse age-length keys. The forward key looks at the distribution of age within each length bin while the inverse key looks at the distribution of length at each age. The former is more precise but has stringent requirements for the way data are collected. The latter approach is more widely applicable. We review the theory of the two keys with particular attention to necessary assumptions and the restrictions on when the methods are applicable. We show it is possible to combine the two approaches into a combined forward-inverse age-length key. This approach can be used to estimate age composition in several years simultaneously. It takes advantage of the efficiency of the forward key in years when that is appropriate, applies the inverse key to years with no age data, and uses a blending of the two approaches for years with moderate amounts of age data.
机译：有两种方法可以根据大量的长度观测值和有限的年龄确定结果来估算年龄组成：正向和反向年龄长度键。前向键查看每个长度档位中年龄的分布，而反向键查看每个年龄段的长度分布。前者更为精确，但对数据收集方式有严格的要求。后一种方法更广泛地适用。我们回顾了两个密钥的理论，并特别注意必要的假设以及方法何时适用的限制。我们证明有可能将两种方法组合成组合的正反年龄长度键。该方法可用于同时估计几年中的年龄构成。它在适当的情况下利用了几年前向键的效率，将反向键应用于没有年龄数据的年份，并结合了两种方法以适度使用年龄数据。

著录项

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