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R Introduction: Part I


If you're looking to count the occurrences of each value within a vector, the summary() function is precisely what you need.

To tally the frequency of each level within a factor, invoke the summary() function with the factor as its argument. This will enumerate the occurrences for each level that the factor can take. For instance:

Remember, the sequence of the levels reported by summary() corresponds to the order defined when you employed the factor() function (without a defined order, it defaults to numerical order or alphabetical order).


For the grades data mentioned earlier compute the frequency of each grade within the grades_f factor.

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Section 3. Chapter 4
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