麻烦帮忙写sas程序~

A 'running average of 30s' means that at the time of giving a measurement value, it takes the average of all measurements taken in the past 30 seconds prior to that point.   10 seconds later, the next log value will reflect an average of the measurements taken over the prior 30 seconds, from a point 10 seconds later than the last log value.  

“平均运行时间30秒”意味着在给出测量值时，需要在该点之前的过去30秒内进行的所有测量的平均值。 10秒后，下一个记录值将反映在前30秒内从最后一个记录值晚10秒的时间点获得的测量值的平均值。

原始数据是一秒一笔，希望能做到已上要求~ 感谢