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Individual differences |
Methods | Statistics | Clinical | Educational | Industrial | Professional items | World psychology |
A ratio scale of measurement is one based on a fixed zero point and where differences between values can be quantified in absolute terms.
A good example is age where equal differences between scores represent equal differences between the thing being measured. So that two years between the age of 2 and 4 is the same length as between 32 and 34. It is because of these mathematical properties that it makes sense to talk about someone being twice as old as someone else.