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Interval and Ratio Level of Measurement

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Can you describe interval and ratio level of measurement relating it to healthcare?

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This solution describes interval and ratio level of measurement relating it to healthcare by discussion and example. Supplemented with a related article that expands this response.

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1. Can you describe interval and ratio level of measurement relating it to healthcare?

There are typically four levels of measurement that are defined:
• Nominal
• Ordinal
• Interval
• Ratio
In nominal measurement the numerical values just "name" the attribute uniquely. No ordering of the cases is implied. For example, jersey numbers in basketball are measures at the nominal level. A player with number 30 is not more of anything than a player with number 15, and is certainly not twice whatever number 15 is. In health care, different drugs might be labeled 1 through 5, which are nominal the numbers are only a means of classifying the drugs. Drug number 1 is not more than drug number 2 (as in ordinal level of measurement-see below), nor is drug 2, twice as much as drug 1 (as in ratio levels of measurement). The numbers are merely code numbers for the drugs.

In ordinal measurement the attributes can be rank-ordered. Here, distances between attributes do not have any meaning. ...

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