All of the RF models in this study showed an overall trend of underestimation above the mean and overestimation below the mean ( Fig 2 ) because the marginal yield points were either underestimated or overestimated.
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The sentences
The partial dependence plot for YR illustrates a clear trend of yield increase (approx. 2.5 tons/ha) over the 30 year period in US maize ( Fig 3B ); this increase was accounted for by year only and not other factors included in the model.