[Feature Request]: Multiple and continuous treatments

[kkckk1110]

Describe the feature you want to propose or implement

Hello, thank you for developing such a useful package! I'd like to ask that, how can I estimate the ATE with multiple continuous treatments with this package? Is it possible? Thanks a lot for your attention!

Propose a possible solution or implementation

No response

Did you consider alternatives to the proposed solution. If yes, please describe

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Comments, context or references

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[JanTeichertKluge]

Hi @kkckk1110,

Thank you for your question about the DoubleML package. I think the DoubleMLPLR model is suitable for the proposed problem (continous treatment, ATE). It can handle multiple treatment variables and estimates one average effect for each treatment. For each treatment, the passed learner for ml_m is cloned and fitted. The other treatments are also used as covariates as long as use_other_treat_as_covariate is set to True (default) when the DoubleMLData object is created, e.g. two treatments $D_1$ and $D_2$, the treatment $D_2$ is used as control variable when estimating the effect of $D_1$ and vice versa.
There was a similar issue some time ago where you might be able to find some more information. Usually, we would recommend to fit multiple models for each treatment separately.

Best regards
Jan