Dear Sir,
My study is going combine and compare SP and RP data. According to Apollo manual, I found it provides "P = apollo_combineModels(P, apollo_inputs, functionality)" for combining. I have following questions about the SP-RP joint estimations in Apollo.
1. Is the "apollo_combineModels" based on nested logit? If so, does it mean I can manually develop a nested tree for RP and SP using the related nested logit code? And can I change the "mnl setting"
2. Additionally, can I modify the "mnl setting", as mentioned in the manual, to others (e.g., mmnl) ?
3. Can Apollo estimate the state dependence of RP on SP, and if so, how?
Hope my questions are clear. Thank you so much and look forward for your reply!
Hongrun
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Joint RP/SP estimation: flexibility and measurement of state dependence
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Hongrun Wu
- Posts: 2
- Joined: 24 Jul 2024, 09:26
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stephanehess
- Site Admin
- Posts: 1355
- Joined: 24 Apr 2020, 16:29
Re: Joint RP/SP estimation: flexibility and measurement of state dependence
Hi
1. apollo_combineModels does not use nested logit, it just multiplies probabilities together, it does not matter what the individual models are. See for example also the hybrid choice examples
2. yes
3. you could enter these terms via the utility functions, but be wary of endogeneity issues
Stephane
1. apollo_combineModels does not use nested logit, it just multiplies probabilities together, it does not matter what the individual models are. See for example also the hybrid choice examples
2. yes
3. you could enter these terms via the utility functions, but be wary of endogeneity issues
Stephane