Question: State whether the following variable is an interval or ratio variable? i) Number of car sales per year The solution states that it's an interval variable. But that's wrong. For the variable number of car sales per year a meaningful absolute 0 exists. 0 means, they didn't sell any car, therefore, it's a ratio variable. Or do I miss something?
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I have never encountered the terms "ratio variable" and "interval variable" before. Could you state how your book (or whatever it is you have) defines the two terms? – Arthur Feb 20 '18 at 09:48
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See What is the difference between ordinal, interval and ratio variables? – Mauro ALLEGRANZA Feb 20 '18 at 09:55
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As far as I can tell from @MauroALLEGRANZA's link, the number of car sales per year is a ratio variable. – Arthur Feb 20 '18 at 10:15
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Most "counting" variables are ratio variables. – Graham Kemp Feb 20 '18 at 10:18
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Agreed; I'm not a specialist, but according to the link above, the "sales per year" has an "absolute $0$". Thus, it must be a ratio and not an interval. – Mauro ALLEGRANZA Feb 20 '18 at 10:26