choice-metrics.com

Hi Yenny

In theory, yes, you should be able to estimate both effects, assuming you can find a design. The design process ensures, at least under the assumptions you have made, that the Hessian is invertible, meaning that you can compute the AVC matrix. You will need to be able to do this to ...

Hi Pakhi

First, you should be aware that Nlogit has its own specific forum for answering questions, and questions about other software really should be posted on the software's website, not here. That said, with respect to your question, you can control variable choice set sizes via the data in a ...

This was done a lot in transportation studies in the early 2000s-2010s. The reason was that many studies during this time involved route choices examining toll road uptake. Many of the study areas did not have toll roads at the time, and it was uncertain if respondents drawn from the relevant ...

It is very common to reward survey participants for undertake surveys of all types. Often people bring people into labs to complete surveys for which they are paid for their time. Internet panels are frequently used which pay respondents if and only if they complete the survey. Focus group ...

1. No, you don’t need to exclude them. As you state, the sample of your pilot is too small to draw conclusions of this nature. Indeed, you have done remarkably well to get the other parameters to be statistically significant with such a small sample. I would be highly encouraged by these results.

2 ...

Hi

No, the original data format is correct. Treating it as -999 in Nlogit will get the same result (if you use it correctly, which I will explain below). If you think about the utility functions, you have

u(A) = ... + B1*Con + ...
u(B) = ... + B1*Con + ...
u(C) = 0

Your concern is, if Con = 0 ...

Hi Yuhan

You might also wish to consult de Bekker-Grob et al. (2015) who extended our earlier work. With that out of the way, there are a few ways to proceed that have been tried and found to work in the past.

1. Use an orthogonal design for a pilot. This may or may not be feasible as there are ...

Hi Yuhan

Below are my two cents, for what that is worth.

Q1: There are two ways that come to mind with respect to this question. One is to do it the way you suggest. The second is to use constraints to handle the issue. The way you suggest is probably the quickest and easiest approach, but it ...

Hi Amber

There is a theoretically correct answer and a practical answer to this question. I will start with the practical answer. In general, most people optimize for one set of choices only and use that design irrespective - typically one would use the first choice - so include the no choice. This ...

This really depends on what you are hoping to achieve, but generally no. There are multiple reasons that the properties of a design may not translate directly to the data we use to estimate with. One such reason is what you describe, unequal blocks. In large samples, the efficiency of the design ...