ApolloChoiceModelling forum

Tim

good lesson to always track back to see where you get the first error

Best wishes

Stephane

Tim

do you get any errors when running apollo_inputs = apollo_validateInputs()

Stephane

This year, the courses organised by the Choice Modelling Centre will be available online too (http://cmc.leeds.ac.uk/courses-phds/cpd/)

To discuss one-to-one Apollo training, please write to contact@apollochoicemodelling.com

Hi Yishih On point 1, this was a bug. This has been fixed in v0.1.1 which you can download from http://www.apollochoicemodelling.com/code.html already and which will be released on CRAN sometime this summer On point 2, sorry, but these means and standard deviations are computed inside the code in an...

Tim the sign of the correlation depends on the sign of the product of hinc_sig_20* hinc_sig_20_90. Section Section 9.2.5 in Kenneth Train's book. The Delta method can be used for this, but you'd need to work out the derivatives yourself - they're not implemented in Apollo for the standard errors. Be...

Hi Tim I've looked into your model in detail and I believe I have found the reason this is happening. In your base specification, you use the same coefficient whether the treatment is 20 or 90. In your more general model, you use separate parameters. Now, you see that in the MNL model, the more gene...

Hi Tim thanks for sharing the code and data with me which allowed me to investigate this. On my machine, the code runs fine with Sobol and with other draws. The error you are getting is actually not by Apollo but by randtoolbox which is called by Apollo for Sobol draws. Can I suggest that in the fir...

Hi Richard on point 1, what you do is indeed the easiest and best way of doing it. You could use the same list for the different components, but you would need to reset it in between each component (so you start with an empty one). While that would save a little memory compared to creating new lists...

Hi Houman

thanks, this was a bug. This has been fixed in v.0.1.1 which you can download from the website (http://www.apollochoicemodelling.com/code.html)

Best wishes

Stephane

Tim that's a much larger difference in fit than one would expect with different draws but is in line with recent tests I've done on antithetic draws and changing signs of sigmas. What happens when you use your model with different draws, but use the results from the reduced model as starting values ...