The Babsonchart (yes, no space) was started in 1906-1907, according to Babson's autobiography where its construction is covered in quite a bit, but not complete, detail in Chapter 13. He acknowledges the acquaintance of Benner, from whom he drew the idea of a composite, and accords George Swain with the idea of drawing a  normal line through the chart.
  and   and
Constructed on the basis of 12 statistical series (4 commercial, 4 monetary and 4 financial), Babson's model had the special feature of combining them by simple addition (after reduction to a common base, the average for 1903 - 1904) into a single index whose fluctuations are intersected by a discretionary average line. It seeks to model a 20-year cycle in four stages: overexpansion, decline, depression, and improvement, which reflects Benner's influence.

若能收集到该词条相关资料的跟帖者给予奖励，根据收集资料的水平给予10～100不等的论坛币，当然也可以谈谈自己的看法，上传资料等等，请大家尽量不要复制一些搜索引擎很容易收集到的资料。

     我每天都会发送不等数量的词条，所以诚邀不同统计背景的各路大侠给予评论。

     欢迎大家多多跟帖！要数量也要质量哟