求翻译：第四，建立精算模型，运用matlab软件测算长三角地区现行农村养老保险的替代率，得出影响待遇水平最显著的因素是参保年龄、缴费率和投资收益率，据此提出长三角地区新农保调整的方向；是什么意思？

IV, established actuarial model, the use of MATLAB software for measuring current in Yangtze River Delta the replacement rate of old-age insurance in rural areas, came to influence treatment level of insured ages, is the most significant factor contribution rate and the rate of return on investments

The first 4 actuarial model, and the establishment is measured using matlab software long 3 point areas of existing rural endowment insurance rate of substitution treatment level, concluded that the most significant factor affecting the insured is age, contribution rates and investment yield on whic

Fourth, establishes the calculation model, surveys the long triangle area present countryside old-age insurance using the matlab software the substitution rate, obtains the influence treatment level most remarkable factor is the senate guarantees the age, the payment rate and the investment returns

IV, established actuarial model, the use of MATLAB software for measuring current in Yangtze River Delta the replacement rate of old-age insurance in rural areas, came to influence treatment level of insured ages, is the most significant factor contribution rate and the rate of return on investments

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