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 January 8th, 2013, 01:30 AM #1 Newbie   Joined: Jan 2013 Posts: 2 Thanks: 0 Please help, Third moments matrix Hi this is my problem Matrix A = x11 x12 x13 x14 x15 x21 x22 x23 x24 x25 x31 x32 x33 x34 x35 Then I need to find matrix of second moments and third moments, so I did Matrix B = x11-?1 x12-?1 x13-?1 x14-?1 x15-?1 x21-?2 x22-?2 x23-?2 x24-?2 x25-?2 x31-?3 x32-?3 x33-?3 x34-?3 x35-?3 Since variance-covariance matrix = ?(xi-?i) (xj-?j), therefore second moments matrix can be calculated as: M2 = B.B' which is 3 by 3 matrix This computation is fine for me, however, the third moments which can be calculated as: M3 = ?(xi-?i) (xj-?j) (xk-?k) or M3 = B.B' ? B' The answer should be matrix 3 by 9 or n by n2, but I couldn�t do that. I used the command in Matlab such as 1. M3=kron((B*transpose(B)),transpose(B)) Or 2.1 Give C = B*transpose(B), then, 2.2 M3=kron (C,transpose(B)) But the answer is a matrix 15 by 9 which I think it is incorrect. Please help me to find the right way to solve it, Many thanks!!! Tags matrix, moments Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Similar Threads Thread Thread Starter Forum Replies Last Post karoon Linear Algebra 0 January 8th, 2013 01:09 AM jackmorgan3 Advanced Statistics 1 August 11th, 2012 07:28 PM fc_groningen Advanced Statistics 1 February 21st, 2011 05:15 PM thapchi Advanced Statistics 0 March 19th, 2010 09:39 PM benjaminmar8 Advanced Statistics 0 April 10th, 2008 08:36 PM

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