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From |
"Nadeem Shafique" <nadeemshafique@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: RE: Extracting Matrices from dataset |

Date |
Mon, 20 Aug 2007 17:51:20 +0500 |

Respected Nick I am so grateful for your response. Actually i wish to split my data set into several matrices so I can perform Multivariate ANOVA on the extracted matrices. The solution that you have posted will simply transform my data set into a single matrix. Can you tell me the solution of this problem that how several matrics can be extracted from a data set on the basis of a grouping variable. Looking forward for a positive reply from your side. Best Regards, Nadeem Shafique On 8/20/07, Nick Cox <n.j.cox@durham.ac.uk> wrote: > Two earlier versions of this posting appeared yesterday. > They referred to Mata. > > As with other concurrent threads, questions that are > not precise, or even stated, or which seem to be easily > answerable from the documentation tend to get little or no > response. > > I have two further comments: > > 1. Functions to read Stata variables into Mata are > well documented in the Mata documentation. You shouldn't > need to write any new functions. See -help m4_stata-. > > 2. As you don't state what you want to do with these matrices, > it isn't clear whether your inclination to use Mata is > right for your problem. > > Nick > n.j.cox@durham.ac.uk > > Nadeem Shafique > > > I wish to extract matrices based on a grouping varible in the dataset. > > Consider the following example suppose I have three groups (1,2 and 3) > > entered in "gr" variable > > > > m v1 v2 v3 gr > > ********************************** > > 23 1 2 3 1 > > 11 3 1 2 1 > > 23 2 2 1 1 > > > > 25 1 2 3 2 > > 23 2 1 2 2 > > 28 3 3 1 2 > > > > 2 1 1 2 3 > > 3 1 3 1 3 > > 1 2 1 2 3 > > > > and i wish to extract three vectors say > > > > m_1=(23,11,23) > > > > m_2=(25,23,28) > > > > m_3=(2,3,1) > > > > or I wish to extract three matrices say > > > > v_1=(1,2,3\3,1,2\2,2,1) > > > > v_2=(1,2,3\2,1,2\3,3,1) > > > > v_3=(1,1,2\1,3,1\2,1,2) > > > > > > similary if i have four groups then generated matrices or vectors > > should be four and if i have five groups then the generated matrices > > should be five and so on. > > * > * For searches and help try: > * http://www.stata.com/support/faqs/res/findit.html > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > -- Nadeem Shafique Butt * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**RE: st: RE: Extracting Matrices from dataset***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

**References**:**st: Extracting Matrices from dataset***From:*"Nadeem Shafique" <nadeemshafique@gmail.com>

**st: RE: Extracting Matrices from dataset***From:*"Nick Cox" <n.j.cox@durham.ac.uk>

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