What's the official name of a 1 to 1 line plot?

 What's the official name of a 1 to 1 line plot?

The official name of the line is 'identity line' or 'line of equality'. And if you are comparing measured data with predicted data, or two different models, you should standardize the axis. The starting and ending point of both axes should be the same. You can also plot the trend line in the scatter plot (measured ~ predicted) to better visualize the difference between the 1:1 line and the actual trend in the model.

Mathematically, it can be written as the line where:

y=x

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