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From |
Valerie Orozco <Valerie.Orozco@toulouse.inra.fr> |

To |
"statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu> |

Subject |
st: Problem with nlcom (expression too long) |

Date |
Tue, 19 Feb 2008 21:48:51 +0100 |

Hello, I have a problem with “nlcom” due to a problem of length. I try to estimate a lot of coefficients from a first estimation. The problem of length comes from the fact that some coefficients I have to estimate are also combinations of coefficients I estimate in the same “nlcom” command and so, it implies long expressions. I do that because I need all the coefficients in e(b) and e(V). (If I do in 2 steps, I don’t have the estimated variance covariance matrix of the transformed coefficients) For example, some coefficients I have to estimate after my estimation are: a14: 1 - ( _b[a1]+ _b[a2]+ _b[a3]+ _b[a4]+ _b[a5]+ _b[a6]+ _b[a7]+ _b[a8]+ _b[a9]+ _b[a10]+ _b[a11]+ _b[a12]+ _b[a13]) b14: - ( _b[b1]+ _b[b2]+ _b[b3]+ _b[b4]+ _b[b5]+ _b[b6]+ _b[b7]+ _b[b8]+ _b[b9]+ _b[b10]+ _b[b11]+ _b[b12]+ _b[b13]) g1vs1: _b[teta_1vs1] - _b[a1] * _b[a1] + _b[a1] g1vs2: _b[teta_1vs2] - _b[a1]* _b[a2] g1vs3: _b[teta_1vs3] - _b[a1]* _b[a3] g1vs4: _b[teta_1vs4] - _b[a1]* _b[a4] g1vs5: _b[teta_1vs5] - _b[a1]* _b[a5] … g1vs14: -( _b[teta_1vs1] - _b[a1] * _b[a1] + _b[a1] + _b[teta_1vs2] - _b[a1] * _b[a2] + _b[teta_1vs3] - _b[a1] * _b[a3] + _b[teta_1vs4] - _b[a1] * _b[a4] + _b[teta_1vs5] - _b[a1] * _b[a5] + _b[teta_1vs6] - _b[a1] * _b[a6] + _b[teta_1vs7] - _b[a1] * _b[a7] + _b [teta_1vs8] - _b[a1] * _b[a8] + _b[teta_1vs9] - _b[a1] * _b[a9] + _b[teta_1vs10] - _b[a1] * _b[a10] + _b[teta_1vs11] - _b[a1] * _b[a1 1] + _b[teta_1vs12] - _b[a1] * _b[a12] + _b[teta_1vs13] - _b[a1] * _b[a13] + 0) /*it would be easier to write g1vs14: -( g1vs1 + g1vs2 + g1vs3+ g1vs4 + g1vs5 + …. +g1vs13)*/ g2vs14: -( _b[teta_1vs2] - _b[a2] * _b[a1] + _b[teta_2vs2] - _b[a2] * _b[a2] + _b[a2] + _b[teta_2vs3] - _b[a2] * _b[a3] + _b[teta_2vs4] - _b[a2] * _b[a4] + _b[teta_2vs5] - _b[a2] * _b[a5] + _b[teta_2vs6] - _b[a2] * _b[a6] + _b[teta_2vs7] - _b[a2] * _b[a7] + _b[teta_2vs8] - _b[a2] * _b[a8] + _b[teta_2vs9] - _b[a2] * _b[a9] + _b[teta_2vs10] - _b[a2] * _b[a10] + _b[teta_2vs11] - _b[a2] * _b[a11] + _b[teta_2vs12] - _b[a2] * _b[a12] + _b[teta_2vs13] - _b[a2] * _b[a13] + 0) …. The main problem concerns g14vs14 which is equal to -(sum on i of the g`I’vs14), because if I write g14vs14 in terms of the tetas, I have a very long expression….and stata tells me : expression too long r(130); If someone has an idea… Thank you very much. Valérie ------------------------------- Valérie OROZCO Toulouse School of Economics (INRA-GREMAQ) 21, allée de Brienne F-31000 Toulouse, France MF 426 +33 5 61 12 85 91 ------------------------------- * * 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/

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