there are aliased coefficients in the model

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by jon890 » Wed Nov 14, 2018 2:59 pm

Hi,first of all English is not my first language and I do the statistic in French originally but I will try to explain my problem as Cleary as possible but if you have some questions or if not clear tell me.

https://imgur.com/a/WrVfuHI (caption of my problem)
Image

As you can see on the picture, I have the following error : there are aliased coefficients in the model. I have trying to create dummy variable to represent de Variable " Traitement " with " IF(Traitement== "Acupuncture",1,0) where " acupuncture is normally a nominal variable.

But As I said I get the error " here are aliased coefficients in the model "

Thank you in advance for your help
jon890
 
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by jonathon » Wed Nov 14, 2018 10:21 pm

hey,

yeah, i'm never quite sure how to explain this. it's typically where you have many levels (or many cells in your design), and not a lot of observations.

https://stats.stackexchange.com/questio ... efficients

if you attach a .omv file i might be able to provide a better explanation.

cheers

jonathon
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jonathon
 
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