求翻译：对2012年5到8月的数据进行估计。这些数据都是实际值At-1,由于观察值的变动不是很大，所以A选择为0.5. 最后，使用指数平滑法的公式来计算出宝马9月份的需求量。是什么意思？

Estimated 5-8 months of data in 2012. These data are actual values ​​at-1, due to the observed changes in the value is not large, so a Select 0.5. Finally, using the exponential smoothing formula to calculate the BMW in September demand.

In 2012 5 to 8 months of data. These data are the actual values At -1, because of the observed changes in the value are not very big, so select A 0.5 is finally, using exponential smoothing the formula to calculate the BMW, the demand for the month of September.

Carries on the estimate to 2012 5 to August data.These data all are actual value At-1, because the observation value change is not very big, therefore the A choice is 0.5. Finally, the use index smoothing procedures formula calculates BMW September the demand.

Data for estimation of 2012 to August. These data is the actual value of At-1, as the observed changes in the value of the is not very large, so a choice to 0.5. Finally, use smooth law of index formulae to calculate demand for BMW in September.

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