I have calculated two models, model A : ten random coefficients, model B : ten random coefficients and I have allowed for differences between genders in the cost coefficient
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randcoeff[["b_cost"]] = -exp( mu_log_b_cost + sigma_log_b_cost * draws_cost + (gender == 1) * ( mu_male_cost + sigma_male_cost * draws_male_cost))
here I put the results:
Model A:
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asc_A 2.151528 0.22276 9.658 0.26878 8.005
asc_B 2.211906 0.23028 9.605 0.27836 7.946
asc_C 0.000000 NA NA NA NA
mu_b_Assistance_emergency_unit 0.030000 NA NA NA NA
mu_b_Assistance_emergency_call 0.160136 0.09213 1.738 0.08260 1.939
mu_b_Assistance_smart_routes 0.577922 0.12109 4.773 0.12325 4.689
mu_b_Automatic_speed_safe_distance 0.100000 NA NA NA NA
mu_b_Automatic_speed_speed_limit 0.560489 0.16221 3.455 0.17030 3.291
mu_b_Automatic_speed_risky_areas 0.345235 0.16378 2.108 0.16818 2.053
mu_b_Collision_avoidance_front_side 0.100000 NA NA NA NA
mu_b_Collision_avoidance_rear_side 0.345127 0.09592 3.598 0.09306 3.709
mu_b_Collision_avoidance_blind_spot 0.346942 0.10482 3.310 0.10468 3.314
mu_log_b_cost -4.908550 0.07708 -63.678 0.08272 -59.337
sigma_b_Assistance_emergency_unit -0.680916 0.18195 -3.742 0.18564 -3.668
sigma_b_Assistance_emergency_call -0.444675 0.24878 -1.787 0.26330 -1.689
sigma_b_Assistance_smart_routes 1.300542 0.17620 7.381 0.19487 6.674
sigma_b_Automatic_speed_safe_distance 0.913538 0.18647 4.899 0.19675 4.643
sigma_b_Automatic_speed_speed_limit 0.540927 0.20983 2.578 0.20854 2.594
sigma_b_Automatic_speed_risky_areas -0.689575 0.17069 -4.040 0.16743 -4.119
sigma_b_Collision_avoidance_front_side -0.725422 0.17067 -4.251 0.16538 -4.386
sigma_b_Collision_avoidance_rear_side 0.465637 0.23245 2.003 0.22063 2.110
sigma_b_Collision_avoidance_blind_spot -0.934059 0.16729 -5.584 0.17004 -5.493
sigma_log_b_cost -1.167197 0.07783 -14.996 0.08466 -13.787
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asc_A 2.12731 0.20462 10.396 0.25029 8.499
asc_B 2.19177 0.21065 10.405 0.25676 8.536
asc_C 0.00000 NA NA NA NA
mu_b_Assistance_emergency_unit 0.03000 NA NA NA NA
mu_b_Assistance_emergency_call 0.13904 0.08710 1.596 0.08286 1.678
mu_b_Assistance_smart_routes 0.53068 0.11150 4.760 0.11510 4.611
mu_b_Automatic_speed_safe_distance 0.10000 NA NA NA NA
mu_b_Automatic_speed_speed_limit 0.54664 0.15187 3.599 0.15773 3.466
mu_b_Automatic_speed_risky_areas 0.31619 0.15504 2.039 0.15844 1.996
mu_b_Collision_avoidance_front_side 0.10000 NA NA NA NA
mu_b_Collision_avoidance_rear_side 0.32022 0.08860 3.614 0.09112 3.514
mu_b_Collision_avoidance_blind_spot 0.29924 0.09811 3.050 0.09934 3.012
mu_log_b_cost -5.09219 0.07935 -64.176 0.09669 -52.668
mu_male_cost -0.26587 0.10362 -2.566 0.12654 -2.101
sigma_b_Assistance_emergency_unit -0.46741 0.18346 -2.548 0.23588 -1.982
sigma_b_Assistance_emergency_call -0.53741 0.14835 -3.623 0.15022 -3.578
sigma_b_Assistance_smart_routes -1.30353 0.16783 -7.767 0.23157 -5.629
sigma_b_Automatic_speed_safe_distance 0.92836 0.17130 5.419 0.20661 4.493
sigma_b_Automatic_speed_speed_limit -0.40859 0.15645 -2.612 0.15647 -2.611
sigma_b_Automatic_speed_risky_areas 0.62139 0.14442 4.303 0.15242 4.077
sigma_b_Collision_avoidance_front_side 0.60242 0.16110 3.739 0.17589 3.425
sigma_b_Collision_avoidance_rear_side -0.35168 0.20753 -1.695 0.24409 -1.441
sigma_b_Collision_avoidance_blind_spot -0.95595 0.14599 -6.548 0.17027 -5.614
sigma_log_b_cost 1.34944 0.08403 16.058 0.09832 13.724
sigma_male_cost 0.54037 0.08825 6.124 0.10083 5.359
Model A :
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> (mean(wtp_routes)); (sd(wtp_routes))
[1] 154.4723
[1] 734.7984
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> (mean(wtp_routes)); (sd(wtp_routes))
[1] 263.9358
[1] 2040.514
There is a big difference, while the coefficients are similar. Could you give any insights on this?
I really appreciate any hint. Thank you in advance.
Best regards,
Georgios