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How to control the data trend upward or downward

Time:02-26

I have a set of data, this group of data I want to draw him in accordance with the downward trend, but the data itself is from low to high, can't order because the data are real-time, can now confirm the data is must gradually upward, but the actual situation of this data should go down, data analysis is used to calculate the variance coefficient of I, because small amounts so he is always the lowest for the first time, because the second time will be great will probably have the gap by about 70% after each data with the second gap is not more than 10%, is there any way to make trend first and then the second largest proportion to the amount of reduced proportion with the first time at least look don't gap is too big, is 100% for the first time for the best, for example, can fluctuate, behind the time urgent please!!
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