choice-metrics.com

thank you for your reply.

Attribute with only two levels gives collinearity error during the estimation process for that attribute.

Difference in utility remains the same the so collinearity is evident.

Does this mean we should avoid 2 levels for an attribute ?

thank you for your post.

the following syntax crashes Ngene ?


Design
;alts = A*, B*
;rows =6
;eff = (mnl,d)
;alg=mfederov
;require:
B.cost - A.cost <=1 and A.cost - B.cost <=1,
A.cost>B.cost and A.find<B.find,
A.cost>B.cost and A.walk<B.walk
;model:
U(A) = b2[(n,-0.2015755,0.1115085)] * walk[1 ...

thank you for your post, it has been helpful in my understanding.

I have few basic queries, please advise if I should use another forum.

b3[(n,-0.3522991,0.2165178)] * cost[0, 5, 10,15,20,25]

-0.352 (This value is coefficient from estimation software, This coefficient is log of odds ?

After (0 ...

thank you for your reply.

I conducted small pilot study with sample size n=10

"Find" attribute got omitted in the estimation software so I had to guess estimate the bayesian prior for 'Find' attribute.

**Is there any reasons why this attribute could be omitted ?

*** Should I include the ...

Thank you for your reply.

This is from your previous post
"2. Each design will be different and there is no value of D-error that is good or bad, this is case specific. It usually helps best to look at the S-estimates, which tell you the likely sample size needed to estimate the parameters ...

thank you for your reply.
The syntax below gives 12 scenarios, only 6 scenario are neutral but remaining 6 are dominant.

*** Can I only pick 6 scenarios from the 12 scenarios ? If I do this, Can this still be efficient design or simply fractional factorial ?

Design
;alts = A*, B*
;rows = 12
;eff ...

Hi
I am Alex Karki from Sydney.
Thank you for Ngene manual which is easy to understand.

I have two alternatives A & B and following attributes to choose parking.
1. Walk time to destination
2. Parking cost
3. Finding parking space(search time)

Relation between Attributes.
1. If Parking Cost ...