For the defect that it is hard to determine the smoothing parameter in time-varying conditions, the adaptive optimizing strategy based on contributing ratio is proposed.

针对广义回归网络在时变环境下难以确定平滑因子，自适应能力弱的缺点，提出了一种基于贡献率的选择优化方案。

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In fact, so few Brazilians pay for pensions, and so many get them, that the country has 35 pensioners for every 100 contributing workers, a higher ratio than in the United States.

ECONOMIST: Brazil��s pension system

Another contributing factor to this crunch is the ratio of seed stage funding and Series A investments.

FORBES: Series A Crunch: Why Startups Will Use Crowdfunding Instead

Would the average pensioner whose savings were contributing to the bankers' bonanza be happy with that ratio?

WSJ: Bankers Are Still There for Bashing