# Normal Equation in Linear Regression

In linear regression we’ve talked about, we found optimum theta by iterating with gradient descent.

The “Normal Equation” is a method of finding the optimum theta without iteration.

### Comparison of gradient descent and normal equation

Gradient Descent | Normal Equation |
---|---|

Needs to choose alpha | No need to choose alpha |

Needs many iterations | No need to iterate |

Works well when n is large | Slow if n is very large |

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