One is:(adsbygoogle = window.adsbygoogle || []).push({});

http://en.wikipedia.org/wiki/Chi-squared_distribution

where at the bottom of the page, chi-square = sum of something devided by variance.

However, here:

http://www.napce.org/documents/research-design-yount/23_chisq_4th.pdf [Broken]

where the chi-square formula is that the sum of the same thing devided by expectation value.

Which formula is right then?

**Physics Forums - The Fusion of Science and Community**

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Why does Chi-square formula have two different ones?

Loading...

Similar Threads - does square formula | Date |
---|---|

A How does it not contradict the Cohen's theorem? | Sep 15, 2017 |

A Why does Polychoric Reduce to two Factors? | Sep 11, 2017 |

Chi-square test: why does it follow a Chi-square distribution | Apr 14, 2014 |

Why does conditional probability used in mean square error equal zero? | Mar 27, 2014 |

**Physics Forums - The Fusion of Science and Community**