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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