课程: Cleaning Bad Data in R

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Unit conversions

Unit conversions

课程: Cleaning Bad Data in R

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Unit conversions

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- [Instructor] One of the most perplexing issues in data analysis arises when you encounter a data set that doesn't explain itself very well. These issues can often be traced to a lack of metadata and, in particular, a failure to specify units. Sometimes we can make inferences about the units involved simply by taking a look at the data set. For example, take a look at this variable, weight. When it stands alone, there's not much that we can figure out or do with this data. What is it weighing? What units of measure are specified here? Are these pounds, kilograms, ounces? We really can't tell just from looking at this single variable. But then let's add a little context to the data. Now we know that this is a table of information about people and, specifically, teenage boys. We can apply a little domain knowledge here and then make the assumption that these measurements are in pounds. Other units of measure wouldn't make…

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