quartile etymology

Etymology:

The word "quartile" comes from the Latin word "quartilis," which means "fourth part."

Meaning:

A quartile is a statistical measure that divides a set of data into four equal parts. The three quartiles are:

  • Lower quartile (Q1): The value below which 25% of the data falls.
  • Median (Q2): The value that separates the lower 50% of the data from the upper 50%.
  • Upper quartile (Q3): The value below which 75% of the data falls.

Origin:

The concept of quartiles was first introduced by British statistician Francis Galton in 1880. Galton recognized the importance of dividing data into smaller parts to better analyze distribution. He proposed the use of quartiles to represent the following three points in a data set:

  • The point below which 25% of the data falls.
  • The point below which 50% of the data falls.
  • The point below which 75% of the data falls.

Over time, the term "quartile" became widely adopted in statistics and is now commonly used to describe these three division points.

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