Introducing socio-demog and LVs in MMNL
Posted: 12 Jul 2023, 17:13
Hi all,
Working so far with different shelf software, socio-demog, and LVs could only be included as interaction vars (with one of the attributes) since there is no variation in these vars within respondents. However looking at the examples in Apollo manual (e.g. the spinal Surgery study or the NHS acute hospitals one), it seems that both can be introduced as 'stand-alone' variables, or as interacting with the ASCs.
In the latter case, is it correct to include LV as: Lambda_LV* LV rather than define the ASC as, for example: asc_bus= asc_ALT_base+Lambda_LV*LV
Also, do the same socio-demos that appear in the LV structural model need to be included also in the choice model (but not the other way around)?
Best,
Anat
Working so far with different shelf software, socio-demog, and LVs could only be included as interaction vars (with one of the attributes) since there is no variation in these vars within respondents. However looking at the examples in Apollo manual (e.g. the spinal Surgery study or the NHS acute hospitals one), it seems that both can be introduced as 'stand-alone' variables, or as interacting with the ASCs.
In the latter case, is it correct to include LV as: Lambda_LV* LV rather than define the ASC as, for example: asc_bus= asc_ALT_base+Lambda_LV*LV
Also, do the same socio-demos that appear in the LV structural model need to be included also in the choice model (but not the other way around)?
Best,
Anat