Search found 6 matches

by mquaife
Fri Feb 23, 2018 9:37 am
Forum: General questions about choice experiments
Topic: Realistic efficient designs with prices and quantities
Replies: 3
Views: 13464

Re: Realistic efficient designs with prices and quantities

Thank you John and Michiel, useful insights from you both.

John - I missed your message before we had to go into the field, but we ended up optimising on the discrete component as you also did. Will be really interested to hear about developments in discrete-continuous designs.

Best wishes
Matt
by mquaife
Tue Jan 23, 2018 8:35 am
Forum: General questions about choice experiments
Topic: Realistic efficient designs with prices and quantities
Replies: 3
Views: 13464

Realistic efficient designs with prices and quantities

Hi,

I am designing a v simple task where people choose their favourite food shopping baskets, hoping to predict substitution patterns from price changes. I therefore need to show respective product quantities and associated prices in each task, and need to estimate a price parameter and parameters ...
by mquaife
Fri May 19, 2017 11:32 pm
Forum: Support for Ngene Desktop (v1.x)
Topic: Calculating attribute combinations excluded by constraints
Replies: 2
Views: 7297

Re: Calculating attribute combinations excluded by constrain

Hi Michiel

Thank you very much - that is precisely what I was searching for. Appreciate your quick response despite study leave.

Matt
by mquaife
Thu May 18, 2017 8:27 am
Forum: Support for Ngene Desktop (v1.x)
Topic: Calculating attribute combinations excluded by constraints
Replies: 2
Views: 7297

Calculating attribute combinations excluded by constraints

Hi all,

Thank you for developing such useful software and for maintaining this useful support network

I would like to respond to a comment on a paper where I have used a d-efficient design with constraints of how frequently a product can be used. A reviewer has asked us to calculate the number of ...
by mquaife
Thu Sep 24, 2015 3:46 am
Forum: Support for Ngene Desktop (v1.x)
Topic: Constrained Designs
Replies: 2
Views: 6023

Re: Constrained Designs

Thanks very much Michiel, have played with those constraints and have a design up and running
by mquaife
Thu Aug 06, 2015 1:17 am
Forum: Support for Ngene Desktop (v1.x)
Topic: Constrained Designs
Replies: 2
Views: 6023

Constrained Designs

Hi Guys,

First of all - congratulations on creating such an accessible way of entering into the murky world of DCE design, it has been an enjoyable process thus far.

I am having a little trouble constraining attributes in my syntax below. Our experiment is looking at 5 different products plus an ...