**Cartesian equation: **

*y* = √(2π) exp(-*x*^{2}/2)

**Click below to see one of the Associated curves.**

If your browser can handle JAVA code, click HERE to experiment interactively with this curve and its associated curves.

This curve, the normal curve of error, originated with de Moivre in 1733. It was also studied with Laplace and Gauss.

The name *frequency curve* also applies to a great variety of other curves.

JOC/EFR/BS January 1997

The URL of this page is:

http://www-history.mcs.st-andrews.ac.uk/Curves/Frequency.html