Like to compare performance data of the machine should select the type of data in statistical figures, production of machines for each of the intervals and uses statistical methods to aid in data analysis, etc.
For example, to compare the efficiency of the machine, choose the type of statistical data on the production of each machine of that time. And use statistical methods to the analysis of such data.
As to the comparison analysis of the production efficiency of the machine type data is statistical figures production of each machine of any given time.And so on.