Income is a ratio measure. In ratio measures, one can order categories, specify the difference between two categories, and the value of zero on the variable represents the absence of the variable. Thus, income can take on values of $0, $10, $30,000, etc. Zero dollar income means the absence of income, making income a ratio measurement.
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It is a ratio scale of measurement.
The year is interval scale (no natural zero); your age is ratio.
No, it is a ratio scale.
It is on the interval scale.
no