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I' m doing a survival analysis using machine learning with random forest method.
There are two groups for comparison.
But two groups are so unmatched in baseline characteristics. I performed propensity score matching with 1:1 ratio which eliminated all inequalities(assess by ASMD plot). But my sample volume dropped to 30%.
2:1 ratio PSM was not satisfactory regarding to matching performance.
Is it necessary to match data groups before random forest?

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  • $\begingroup$ Can you show some sample data from each group? $\endgroup$ Apr 1, 2021 at 19:12

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