View License

Download apps, toolboxes, and other File Exchange content using Add-On Explorer in MATLAB.

» Watch video

Highlights from

3.7 | 3 ratings Rate this file 7 Downloads (last 30 days) File Size: 7.84 KB File ID: #3694 Version: 1.0




07 Jul 2003 (Updated )

File gives several sphericity tests as Bartlett and Mauchly to choose.

| Watch this File

File Information

Basically, here we are testing if all the p-axis have the same variability or eigenvalues. There are two tests to choose in a menu form such as the Bartlett and Mauchly's sphericity tests.

Only needs to input the multivariate data matrix and the significance level (default = 0.05). It outputs the sample-size, the p-variables, the observed statistic used to test any deviation from an expected sphericity and the probability that null Ho: is true.

MATLAB release MATLAB 5.3 (R11)
Tags for This File   Please login to tag files.
Please login to add a comment or rating.
Comments and Ratings (5)
12 Jan 2013 sharika

As per the formula given in this link

all calculations require p = degrees of freedom of the factor rather than the levels of the factor.

Comment only
14 Mar 2012 Ben

Ben (view profile)

I second the results deviating massively from SPSS output (regarding Mauchly). p values can differ by as much as 3 orders of magnitude!

06 Aug 2011 Amarelo

I noticed a clear difference in results by this function and a similar test in SPSS (significant vs. non-significant findings). My data contains scores for 17 participants (rows) across three conditions (columns) as input into a one-way ANOVA for repeated measures. What is weird is that the degrees of freedom are completely different, being 2 in SPSS and 5 with this function, as is also the case with the other computed statistics. Which one is right?

Comment only
01 Feb 2010 Kay Thurley

29 Sep 2005 grace kelly

Contact us