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Seymour, IL | When there is only one datapoint per year....
when looking into trend analysis, the typical measure is at least 30 years
I have seen some long term data sets broken down into smaller 20 year breaks inside of the larger trend (study if the trend rate is changing)
Short term averages such as you present are just that... short term averages, and not truly a trend analysis
Beginning and ending dates do have a significant effect.... in terms of trend yield, modern agriculture analysis typically begins in the mid-70's to early 80's time frame.
your data is not wrong, just not looking at long enough duration for a trend.
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Scariest thing in yesterday's data
