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Harmonic mean

The harmonic mean is the reciprocal of the arithmetic mean of the reciprocal of the data. That is

$$ \text{harmonic_mean}(x) = 1 / \text{arithmetic_mean}(1 / x) $$

The harmonic mean is often used to average ratio data. You'll be using it on the price/earnings ratio of stocks in the Standard and Poor's 500 index, provided as std_and_poor500. Price/earnings ratio is a measure of how expensive a stock is.

The dplyr package is loaded.

This exercise is part of the course

Introduction to Writing Functions in R

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Hands-on interactive exercise

Have a go at this exercise by completing this sample code.

# Look at the Standard and Poor 500 data
glimpse(std_and_poor500)

# Write a function to calculate the reciprocal
___ <- ___ {
  ___
}
Edit and Run Code