Outcomes method for biomarkers about biotmle HOT 4 CLOSED

For now, it's best to remove the outcome option in the main biomarkertmle function. In future, we can consider ways to approach this -- with the most obvious idea being to estimate a different parameter entirely (than the ATE), perhaps using the tmle.npvi package.

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It seems that the implementation of a TMLE for a target parameter interpretable as the counterfactual value of the outcome of interest under a posited shift of the observed treatment value, available in the txshift R package, could be useful for this purpose.

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At the present, implementing such an extension of the methodology appears to be outside the scope of this R package.

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Outside the scope of this package. An equivalent shrinkage-based variance estimator should likely be implemented separately in other packages so as to better make use of each of their (likely very different) APIs.

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