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From |
Austin Nichols <austinnichols@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: RE: How to implement ranktest of matrix |

Date |
Thu, 8 Jul 2010 08:28:58 -0400 |

Mark-- The poster might have wanted a statistical test of the rank of the dgp of the matrix (or a comparison of the two matrices), which is what -ranktest- does, right? But how can an N by 1 matrix have rank greater than 1? On Wed, Jul 7, 2010 at 7:39 PM, Schaffer, Mark E <M.E.Schaffer@hw.ac.uk> wrote: > Komi, > >> -----Original Message----- >> From: owner-statalist@hsphsun2.harvard.edu >> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of >> Komi Agbemavi Mati >> Sent: 07 July 2010 20:43 >> To: statalist@hsphsun2.harvard.edu >> Subject: st: How to implement ranktest of matrix >> >> I need to test whether the following matrix have rank 0, 1 >> or 2. I am trying to use ranktest in stata but i don't >> know what to put in Y and what >> to put in Z as described in the help file. >> >> dqdZ1 dqdz2 >> .0002178 .0000277 >> .0003644 .0000637 >> .0022189 -.0004827 >> .0012441 .0000804 >> -.0182371 -.0013471 >> .0026022 .0008305 >> >> When I try the following command >> ranktest dqdZ1 dqdz2, > > If you want to know the rank of a Stata matrix like the one above, you > can use, say, the Mata function rank() (see help mf_rank). You would > move the matrix from Stata into Mata and then use the rank() function. > > -ranktest- is different. (Mea culpa - on re-reading the help file, I > think this could be clearer.) It is for testing the rank of a matrix of > correlations or regression parameters. > > When you say > > ranktest dqdZ1 dqdz2 > > what is happening is basically the same thing as regressing dqdZ1 on > dqdz2 and testing whether the regression parameter is nonzero (i.e., > rank>0). I suspect this isn't what you want, and instead you want the > rank of the Stata matrix above, but perhaps I'm wrong here. > > Hope this helps. > > Cheers, > Mark > * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**RE: st: RE: How to implement ranktest of matrix***From:*"Schaffer, Mark E" <M.E.Schaffer@hw.ac.uk>

**RE : st: RE: How to implement ranktest of matrix***From:*Komi Agbemavi Mati <komi-agbemavi.mati.1@ulaval.ca>

**References**:**st: How to implement ranktest of matrix***From:*Komi Agbemavi Mati <komi-agbemavi.mati.1@ulaval.ca>

**st: RE: How to implement ranktest of matrix***From:*"Schaffer, Mark E" <M.E.Schaffer@hw.ac.uk>

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