[导读] 前面刚转了一篇文章提到了牛顿-拉夫逊（拉弗森）（Newton-Raphson method）方法，感觉这个数学方法很有必要相对深入写一篇文章来总结分享印证一下自己的理解。这是写本文的由来，如果发现文章中有错误之处，请留言交流讨论。 什么是牛顿-拉夫逊方法？

Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, Vol. 271, No. 1346 (Jan. 22, 1963), pp. 324-331 (8 pages) ...

Many economically important characteristics of agricultural crops are measured as ordinal traits. Statistical analysis of the genetic basis of ordinal traits appears to be quite different from regular ...