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Re: st: collinearity/non-convergence problem with -asclogit- command


From   Jade Redoblado <jade.redoblado@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: collinearity/non-convergence problem with -asclogit- command
Date   Tue, 13 Oct 2009 08:46:01 +0800

How many observations do you have, Cielo?

On 10/13/09, Cielo Magno <cielomagno@gmail.com> 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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