Bivariate model — non-linear association

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No user picture. JuanJMV Joined: 07/20/2016

Hi All,

 

I am working on a bivariate model for two continuous variables (normally distributed). 

 

I have checked the association between these variables and looking at the plots the relationship seems to be non-linear. I have run a regression model and the association is significant but it is probably better explained by a quadratic or U-shaped association. 

 

My question is about the bivariate model. Would it be biassed? Is there any way to model these non-linear associations in a twin model? What would be the best approach for this scenario?

 

Thank you so much in advance.

Replied on Fri, 04/11/2025 - 10:55
Picture of user. AdminNeale Joined: 03/01/2013

Interesting question.  Can you share a scatterplot of the two variables to show the non-linearity?  Is there anything about the variables that would make you expect non-linearity or other distributional properties?