How many observations do you have, Cielo?
On 10/13/09, Cielo Magno <[email protected]> wrote:
> 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
>
> *
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>
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