I'm currently working on a research assignment an I'm trying to determine whether a dependent variable like "percentage of correct answers" would be considered interval or ratio data. I was originally thinking ratio because it does seem like there would be a true zero (i.e. getting 0% correct), but I keep finding mixed results online. Plus, I know percentages can be tricky in this sort of situation. Any advice?

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    $\begingroup$ Arguably, either the answer doesn't matter or it depends on contingencies like how many answers there are in toto and the purpose of your analysis. That would explain why online researches do not produce a consistent answer. For instance, if there are only two questions then the possible values of the variable are 0, 50, and 100: in many circumstances it would be more fruitful to analyze that as a nominal variable and treating it as ratio or interval might obscure, rather than reveal, useful information. $\endgroup$ – whuber May 23 '18 at 21:08

All percentages are ratios: the percentage of correct answers is the ratio of correct answers to total answers.

  • $\begingroup$ This is not the sense in which the question intends "ratio" to be understood. $\endgroup$ – whuber May 23 '18 at 21:06

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