Estimated training load error plot

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There seems to be a difference between the error percentage value for each point in the time x estimated load scatter plot and the numbers given next to it. For instance, I now have many workouts where the numbers for power and the HR zone-based estimate are the same, yet when I look them up on the plot, they have non-zero errors. What am I misunderstanding?

Also, on the plot, are the error percentage values from HR-power or power-HR?

Thank you, David, for this ever more useful tool.

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Tx. The error percentages = (estimated training load - actual training load) / actual training load (from power meter). The model updates as new rides with power and HR come in. So when looking at a past ride on the chart the error might be different than if you go to the old ride because the model is different.

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