The discrete least square method is one of methods of weighted residual (MWR) for Solving differential equations.
离散型最小二乘法是解微分方程的加权残值法的一种。
The same annuity product has different MWR when purchased at different age, therefore there is an optimal age for buying an annuity product.
相同产品在不同年龄购买时对应的年金MWR也各不相同，存在最优购买年龄。
Comparing with finite element method, MWR has some advantages, such as simpler computer program, less input data and less computer storage requirements etc.
而本法与有限元法比较，具有程序简单，输入的原始数据少，内存需要量少等优点。
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