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It is a ratio scale of measurement.
diferece between ratio and regression
The year is interval scale (no natural zero); your age is ratio.
The history of the ratio for theÊS&PÊPE 500Êchart has been below 30 since 1880. The ratio started going up around the year 2000. The ratio spiked to over 65 around 2010.
the numerator of the F-ratio