Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
NCTM or The Math Forum.


Math Forum
»
Discussions
»
sci.math.*
»
sci.stat.math
Notice: We are no longer accepting new posts, but the forums will continue to be readable.
Topic:
test for difference in center of mass
Replies:
4
Last Post:
May 7, 2013 12:50 AM




Re: test for difference in center of mass
Posted:
May 5, 2013 1:48 AM


On May 4, 2:17 pm, zim_...@hotmail.com wrote: > Hi, > I'm looking to test for a difference in center of mass between two groups of points. Each point has an x,y,z coordinate and I need to know if the means of the two clouds are significantly different, under the assumption that they are approximately Normally distributed. Can anyone point me to a test I can use? > thanks! > > ~z
When there are only two groups, there are three algebraically equivalent ways to test the hypothesis that the group centroids are the same. The easiest is probably multiple linear regression, with group as the dependent variable and the coordinate values as predictors. The Ftest of the multiple R^2 is exactly equal to the F that you would get from a discriminant analysis or a oneway manova.



