choice-metrics.com

Dear Steve


The model is invariant to any constant added to b1 .... b6, DoF are 5 (b1-b6,...b5-b6). As X6 is result of X1 to X5, the model is only impacted by X1 ... X5

One way to avoid multicollinearity, is to drop one attribute when estimating the model (see Michiel message Oct 23) here X6
1 ...

Hi,

Please note that the 6 attributes have [0,5,10,15,20] as levels, and sum to 50. At least 3 attributes won't show 0. In activity example, the respondent is asked to choose between two 'bundles' with at least 3 activities each..

"Additionally, I would like to ask if there are any methods or ...

Thanks a lot Michiel


It comes from Excel file (when I opened it using NGENE, all columns -except the first one- showed 0),but when I copy the same columns in .TXT file (with comma delimiter), the code went quite fine using the TXT file.
Thanks for the trick

"I would like to add in U(hotelB) & U ...

Hi

;orth = seq

The manual p74
"... sequential orthogonal designs can typically only be generated in cases where each utility function has the same attributes with the same levels (i.e.,
unlabelled alternatives)".

Best
Nassar

Hi

U(alt1) don't have the '/' command and the code is working quite fine when fixing this

Best
Nassar

Hi all

I'm getting an error when trying to develop an availability design

[Modified Fedorov] ERROR: The candidate set of the Modified Fedorov algorithm is smaller than the number of rows specified. That is, there are not enough unique choice sets to generate the number required as specificed in ...

Thanks Michiel

The idea behind such overlap is to be able to estimate and test some Nested-Logit (example here : Stars as Branch)
Your approach helps avoiding invalid designs in NGene. I've also encountered time issues for this (transposing 8.10-11 manual examples)
I'm testing
;alg = mfederov ...

Hi all


I'm trying to investigate some Nested models. So I want
- To force each choice set to propose at least 2 alternatives having the same 'Nest attribute'
Let's take for example the hotel case with Stars as nest
Design
;alts = hotel1, hotel2, hotel3, hotel4, None
;rows = 240
;block = 20
;eff ...