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From |
orozco@toulouse.inra.fr |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: st : Problem of no enough observations |

Date |
Fri, 16 Nov 2007 16:23:05 +0100 |

Dear Statalist, I wonder why Stata tells me that I haven't enough observations to estimate my system of equations with "NLSUR". ("cannot have fewer observations than parameters") In fact, I have a system of equations to estimate. One equation per good `i' : (the coefficients I have to estimate are between the braces {}.) dw`i' = {b`i'} *ddeflexp + {g`i'vs1} * dlnp1+ {g`i'vs2} * dlnp2+ {g`i'vs3} * dlnp3 + {g`i'vs4} * dlnp4 + {g`i'vs5} * dlnp5 + {g`i'vs6} * dlnp6 + {g`i'vs7} * dlnp7 + {g`i'vs8} * dlnp8 + {g`i'vs9} * dlnp9 + {g`i'vs10} * dlnp10 + {g`i'vs11} * dlnp11 + {g`i'vs12} * dlnp12 ) As you can see, I have 13 coefficients to estimate for each good `i' (i=1,...,12) I have 78 observations. The problem just comes because I think Stata calculate the total number of coefficients(13 * 12 = 156), but in fact I have only 13 per good... What's disturbing is that, I estimate a quite similar system with "reg3" (with and without the SURE option) and have no problem... Does someone have an idea??? Thank you very much. Valérie * * 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: st : Problem of no enough observations***From:*"Brian P. Poi" <bpoi@stata.com>

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