[Limdep Nlogit List] best-worst data, ties and models

Leif leifand at u.washington.edu
Sat Nov 7 04:14:52 EST 2009


Dan,
NLOGIT can estimate RPL models using ranks data.  For an earlier release, you had to first estimate an RPL model based on first choice only after you opened up NLOGIT, then you could estimate any RPL models based on ranks.  I'm unaware if that's been fixed in later updates.

And I believe the answer to your 2nd question is that NLOGIT can handle ties in anything but the 1st choice.

Cheers,

Leif Anderson



On Fri, 6 Nov 2009, Daniel Rigby wrote:

>
> In August 2008 Walt Paczkowski asked about data ranked best-worst, ie 4 options with the 'best' and 'worst' options identified.
>
> Bill Greene replied:
> "NLOGIT allows rank data and it allows ties. For your case,  the best is ranked 1, the worst is ranked 3 and the rest are tied for second."
> 	(He added more but I cut that here)
> Later Walt asked the following question
> On page  N10-9, it says .that ranks data may be used with RPLOGIT.  But then on page N17-23, it says that ranks data is not available for it.  Which is it?
> I cannot find a posted answer to this question - can someone clarify whether RPL can accommodate this data format?
>
>
> I have 2 additional questions
>
> 1. Ties
> Looking at NLOGIT  N10-9 manual I see that models estimated on this form of data require the adding of the command:
> ;Ranks $
> and that "The ties must only appear at the lowest level"
>
> This seems inconsistent with Bill Greene's original reply that
> "the best is ranked 1, the worst is ranked 3 and the rest are tied for second."
>
> Can someone clarify whether Nlogit can handle the ties being the middle category, between best and worst: [1,2,2,3]
>
> 2. Items not decomposed into attributes.
> I presume (but better check before I start) that the Best-Worst data used with CLOGIT and (subject to reply) possibly RPL models can be estimated using data where the choice sets comprise single items (ie sets of 4 individual items) rather than the usual case where the options comprise multiple attributes which differ in their levels.
> I am interested in the utility associated with the individual item - they are not decomposed into attributes.
> .
>
> Thanks,
> Dan
>
> Dan Rigby
> Environmental Economics
> Manchester University
>
>
>
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