[Limdep Nlogit List] Simulation Scenario

Wed Dec 18 16:11:41 AEDT 2019

Thank you David for your response. Lastly, could you please comment on my
interpretation of the output after I used the following command.

;simulate
;scenario:sidemi(meda,medb)=1
;arc
;full
;pwt

Attr Changed in | Change in Probability of Alternative
----------------------------------------------------------------------------
Choice MEDA     | MEDA      MEDB      NONE
   x = SIDEMI      |  -.090          -.024      .202
Choice MEDB     | MEDA      MEDB      NONE
   x = SIDEMI   |     -.026          -.064      .174

My interpretation:

One unit increase in SIDEMI, that is from 0 (no side-effects) to 1 (mild
side-effects) would decrease the probability of choosing Med A by 0.90 and
Med B by 0.026 while the probability of choosing no medication (none) would
increase by 0.202 and 0.174 for MedA and MedB respectively.

Your comment will be highly appreciated.

Thanks,

Umair

On Tue, Dec 17, 2019 at 3:38 PM David Hensher <david.hensher at sydney.edu.au>
wrote:

> I think this will result in 0 and 1 becoming 1 and 2
>
> so instead use =1
>
>
> David Hensher
> On 17/12/2019 3:33 PM, Muhammad Umair Khan via Limdep wrote:
> > Dear Bill,
> >
> > Thank you very much for your reply. Can I also use the [+]1 scenario
> > command in case of dummy-coded variables? For example, I have a
> dummy-coded
> > variable, mild side-effects, coded as 0 (no side-effects) and 1 (mild
> > side-effects). Can I simulate a scenario "=[+]1 interpreting that there
> > would be one level increase in the severity of mild side-effects, that
> is,
> > the severity would increase from to mild to, let's say, moderate?
> >
> > Thank you for your time.
> >
> > Umair
> >
> > On Thu, Dec 12, 2019 at 4:57 AM William Greene via Limdep<
> > limdep at mailman.sydney.edu.au>  wrote:
> >
> >
> >> Umair.  Yes, it will change a 1 to 3.  It will also change a 2 to a 4.
> >> Regards
> >> Bill Greene
> >>
> >> On Tue, Dec 10, 2019 at 11:03 PM Muhammad Umair Khan via Limdep<
> >> limdep at mailman.sydney.edu.au>  wrote:
> >>
> >>
> >>> Dear All,
> >>>
> >>> I am a newbie and just started using DCE and NLOGIT. I have three
> >>> alternatives; Medication A, Medication B, No medication. One of my
> >>> attributes is side-effects (SE) (0= no SE, 1= Mild SE, 2= Moderate SE,
> 3=
> >>> severe SE). I am trying to create a simulation scenario by checking the
> >>> probability of taking medication if the severity of side-effects change
> >>> from 1 to 3. I am using the following command:
> >>>
> >>> ;simulate
> >>> ;scenario:sidemi(*)=[+]2
> >>>
> >>> I am assuming that by using [+]2 NLOGIT would assume that I want to go
> >>>
> >> two
> >>
> >>> levels up from 1, that is, from 1 to 3 (mild to severe). Am I correct
> >>>
> >> here?
> >>
> >>> If no, what should be the best way? Furthermore the output I am getting
> >>>
> >> is,
> >>
> >>> for example, the probability of people taking medication would reduce
> by
> >>> 10%. I am interesting in finding out if this 10% is statistically
> >>> significant? Any command through which we can get additional statistics
> >>> such as p-value?
> >>>
> >>> Thank you!
> >>>
> >>> Umair
> >>> _______________________________________________
> >>> Limdep site list
> >>> Limdep at mailman.sydney.edu.au
> >>> http://limdep.itls.usyd.edu.au
> >>>
> >>>
> >>>
> >> --
> >> William Greene
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> >>
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> >
>
>
> --
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