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Article A Note on Estimation Methods of Crop Production at Block Level.
Assuming you wish to compare RMSE of two parameters, use:
\operatorname{RMSE}= \sqrt{\frac{\sum_{t=1}^n (x_{1,t} - x_{2,t})^2}{n}}.
but it is difficult to know if this is pertinent without a deeper understanding of what it is you are trying to test.
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