# How to run Johansen test in Mathematica

Posted 9 years ago
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 Hi,Does anyone have any idea on wether it's possible to run the Johansen Cointegration tests in Mathematica? If not, is the code available somewhere?Xave
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Posted 9 years ago
 You may quickly take a look at this link: http://www.verbeia.com/mathematica/mathecon/mathecon_index.html
Posted 9 years ago
 Thanks Shenghui. I've tried this piece of code but it doesn't seem to work on Mathematica 9.
Posted 9 years ago
 Could you please post some results here or error message?
Posted 9 years ago
 I am trying to test the cointegration between two ETFs.----------------------------------------------------------- ewa = FinancialData["NYSE:EWA", {{2006, 4, 4}, {2012, 4, 9}}, "Value"]; ewc = FinancialData["NYSE:EWC", {{2006, 4, 4}, {2012, 4, 9}}, "Value"]; data = Transpose@{ewa, ewc};  johansenProcedure[levels_?MatrixQ, p_Integer] /; (Dimensions[levels][[ 1]] > (Dimensions[levels][[2]] + p)) := With[{N = Dimensions[levels][[1]], T = Dimensions[levels][[2]], diff = Rest[levels - RotateLeft[levels]], ypt = Drop[levels, -p]}, Module[{x, r0t, rpt, s00, sop, cc, \[Lambda], v\[Lambda], log\[Lambda]},x = Join @@ (Drop[RotateLeft[diff, #], p - 1] & /@ Range[p]);With[{q = Inverse[Transpose[x].x], y0t = Drop[diff, p - 1]},r0t = y0t - x.q.Transpose[x].y0t; rpt = ypt - x.q.Transpose[x].ypt; s00 = (Transpose[r0t].r0t)/T; s0p = (Transpose[r0t].rpt)/T;cc = Inverse[CholeskyDecomposition[(Transpose[rpt].rpt)/T]];{\[Lambda], v\[Lambda]} = Eigensystem[(cc.Transpose[s0p].Inverse[s00].s0p.Transpose[cc])];log\[Lambda] = Log[1 - \[Lambda]];{Reverse[-T* FoldList[Plus, First[log\[Lambda]], Rest[log\[Lambda]]]],Reverse[-T log\[Lambda]], Join[Reverse[Transpose[Transpose[cc].v\[Lambda]]], s00, s0p]} ]]];johansenProcedure[data, 10]and then it keeps running until I abortDot::dotsh: Tensors {<<1>>} and {{0.38,0.42},{-0.21,-0.27},{0.03,0.13},{0.,-0.03},<<44>>,{0.04,0.02},{-0.56,-0.63},<<1455>>} have incompatible shapes. >>
Posted 9 years ago
 @Xavier, Usually if you have error message from your function, the best way to debug is to break a block of codes into separated cells. In your case, I notice this line is broken: r0t = y0t - x.q.Transpose[x].y0t; rpt = ypt - x.q.Transpose[x].ypt;The dimensional mismatch is from here.
Posted 9 years ago
 thanks. Found the problem and it seems to work now.
Posted 9 years ago
 Could you post the code after the fix?
Posted 9 years ago
 If you got it to work, could you uplode the working code?
Posted 9 years ago
 I'm the owner of the website Shenghui linked to. If there are any changes needed to be made to that code, please let me know at the email address on the web site. It is more than ten years since I posted that code and I have not had time to check which of those notebooks still work in version 9. I think I was using version 3 or 4 when I posted all that code. And as I said under the link to that notebook: "I translated the algorithm from Gauss. Untested. Use at your own risk! "