When grey systematic theory at present set up GM (1 , 1 ), it assumes that fit curve passes the first point of modeling data to confirm the integral constant, thus obtained to forecast formula.
目前灰色系统理论在建立GM（1，1）模型时通常采用假定拟合曲线通过建模数据第一点来确定积分常数，从而得到预测公式的方法。
If an economist had a formula that could reliably forecast crises a week in advance, say, then that formula would become part of generally available information and prices would fall a week earlier.
如果一位经济学家有一条能够可靠地提前一个星期预测出危机的公式，那么这条公式将变成一般人都可以得到的信息，而资产的价格便会提前一个星期跌落。
The SPI, Which is used to forecast project completion date , is calculated by using which formula?
进度执行情况指数被用于预报项目的完工日期，是以哪个公式计算的？
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