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From |
Cielo Magno <cielomagno@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: collinearity/non-convergence problem with -asclogit- command |

Date |
Mon, 12 Oct 2009 20:08:35 -0400 |

Hello everyone, I am hoping someone will be able to help me with my problem. I am new with Stata and I am trying to run the -asclogit- command. The model always results in non convergence because of collinear variables. I want to start with a simple model, just 1 alternative-specific variable and 1 case-specific variable but I can’t even get pass it. This is the command I am using: . asclogit choice price2, casevars(age) case (id) alternative (alter) iter(5) This is how my data looks like. There are 11 products, my alternative-specific variables are the price of the product and the amount of money they spent on advertising every month. I tried to replace price2 with the advertising variable and the result is still the same. I also tried creating a dichotomous variable (by transforming my advertising variable into a dichotomous yes/no variable) and using it as the alternative-specific variable but the result is the same – non convergence. +-----------------------------------------------------+ | choice price2 age id alter total_ads | |-----------------------------------------------------| 1. | 1 110 83 33 product1 15488033 | 2. | 0 92 83 33 product2 11891267 | 3. | 0 101 83 33 product3 0 | 4. | 0 77 83 33 product4 0 | 5. | 0 82 83 33 product5 49783.33 | 6. | 0 104 83 33 product6 27916.67 | 7. | 0 122 83 33 product7 21012.50 | 8. | 0 168 83 33 product8 166.67 | 9. | 0 107 83 33 product9 0 | 10. | 0 58 83 33 product10 0 | 11. | 0 153 83 33 product11 0 | |-----------------------------------------------------| 12. | 1 110 61 37 product1 15488033 | 13. | 0 92 61 37 product2 11891267 | 14. | 0 101 61 37 product3 0 | 15. | 0 77 61 37 product4 0 | 16. | 0 82 61 37 product5 49783.33 | 17. | 0 104 61 37 product6 27916.67 | 18. | 0 122 61 37 product7 21012.5 | 19. | 0 168 61 37 product8 166.67 | 20. | 0 107 61 37 product9 0 | 21. | 0 58 61 37 product10 0 | 22. | 0 153 61 37 product11 0 | +-----------------------------------------------------+ I can’t figure out/find a solution to my problem. I am using Stata/IC 11.0 and it is updated. Any help will be greatly appreciated. Thank you very much. Cielo Magno Graduate student Law, Policy & Society Northeatern University * * 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: collinearity/non-convergence problem with -asclogit- command***From:*Jade Redoblado <jade.redoblado@gmail.com>

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