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From |
Stas Kolenikov <skolenik@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: RE: create local from element of matrix e(b) |

Date |
Thu, 14 Oct 2010 14:37:17 -0500 |

On Thu, Oct 14, 2010 at 12:17 PM, Nick Cox <n.j.cox@durham.ac.uk> wrote: > I am trying to create a local that equals an element of matrix e(b) produced by Stata following xtreg, fe. In fact, I am trying to get the first element. > > Here is what I did: > > quietly xtreg mdepc wavedi mdis_coh, fe > . matrix list e(b) > e(b)[1,3] > wavedi mdis_coh _cons > y1 .24873096 .34650713 .83985765 If you don't know the name ahead, but know this is the first element, then the one-liner is mata : st_local( "dif", strofreal( st_matrix("e(b)")[1,1] ) ) You'd expect there should be fewer parentheses... > . local dif = el(e(b), 1,1) > matrix operators that return matrices not allowed in this context > r(509); That this solution does not work is annoying. -el()- is described as a function returning a scalar in the documentation, but in this context it only works if you assign the result to a matrix. With the named matrices, the issue does not arise, though, so the problem is entirely in the pseudo-function e(b). -- Stas Kolenikov, also found at http://stas.kolenikov.name Small print: I use this email account for mailing lists only. * * 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/

**References**:**st: create local from element of matrix e(b)***From:*"Claire Kamp Dush" <ckamp-dush@ehe.osu.edu>

**st: RE: create local from element of matrix e(b)***From:*Nick Cox <n.j.cox@durham.ac.uk>

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