Question about the specification of the MMNL_inter_intra example
Posted: 16 Jan 2024, 14:29
Dear Professors,
I am currently working on a model incorporating a random alternative-specific constant to account for inter-intra heterogeneity. In reading your example, I came across the following definition for the random parameter:
randcoeff[["v_tt"]] = ( exp( mu_log_v_tt
+ sigma_log_v_tt_inter * draws_tt_inter
+ sigma_log_v_tt_inter_2 * draws_tt_inter ^ 2
+ sigma_log_v_tt_intra * draws_tt_intra )
* ( gamma_vtt_business * business + ( 1 - business ) ) )
I am seeking clarification on why there is a term "sigma_log_v_tt_inter_2 * draws_tt_inter ^ 2." Additionally, if I intend to create a random constant under a normal distribution, would the following definition be appropriate? :
randcoeff[["asc_none"]] = mu_none + sigma_none * draw_inter + sigma_none_2 * draw_inter^2 + sigma_none_intra * draw_intra
Thanks in advance for your valuable answer.
Best Regards,
Shawn
I am currently working on a model incorporating a random alternative-specific constant to account for inter-intra heterogeneity. In reading your example, I came across the following definition for the random parameter:
randcoeff[["v_tt"]] = ( exp( mu_log_v_tt
+ sigma_log_v_tt_inter * draws_tt_inter
+ sigma_log_v_tt_inter_2 * draws_tt_inter ^ 2
+ sigma_log_v_tt_intra * draws_tt_intra )
* ( gamma_vtt_business * business + ( 1 - business ) ) )
I am seeking clarification on why there is a term "sigma_log_v_tt_inter_2 * draws_tt_inter ^ 2." Additionally, if I intend to create a random constant under a normal distribution, would the following definition be appropriate? :
randcoeff[["asc_none"]] = mu_none + sigma_none * draw_inter + sigma_none_2 * draw_inter^2 + sigma_none_intra * draw_intra
Thanks in advance for your valuable answer.
Best Regards,
Shawn