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Other Analyses

This page highlights several other notable findings. For additional discussion of other analyses in this study, please see the article.

Last updated 07/15/2025.
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Remands Without Vacatur

When a court remands a rule without vacatur, it leaves the rule in place while typically providing the issuing agency with an additional opportunity to address a flaw in the rule or rulemaking process. Reasonable minds could differ over how to treat this remedy in terms of agency wins and losses. Is it a win because the rule wasn’t totally cast aside? Or is it a loss because the court found that the agency made an error? Our study coded all controlling opinions based on a court’s conclusions about the challenged provision(s) rather than the remedy ordered, which means that remands without vacatur were coded as either agency losses or mixed results. But some readers may find deeper analysis of this data interesting. 

Across all administrations, roughly 21% of overall agency losses (i.e., losses and mixed results combined) by controlling opinions resulted in remands without vacatur. Here, too, however, results differed by administrations. The percentage of losses resulting in remands without vacatur declined steeply in the first Trump Administration. It declined further during the Biden Administration. This could suggest that courts have become less willing to use the remedy or that the flaws found in the Trump or Biden Administration’s major rules were more likely to cause courts to vacate (or totally strike down) these rules rather than remand for the agency to fix them. 

Partisan Trends

Many empirical studies have examined whether there is a correlation between agency win rates and the party of the President who appointed the reviewing judge(s). This study identified:

(a) the party of the individual judge’s or majority’s appointing President(s), and

(b) the opinion author’s appointing President. 

We find that Republican administrations perform slightly better in front of Republican-appointed judges and panels where a majority of the judges were appointed by Republicans, and vice versa for Democratic administrations. This effect is more pronounced for Democratic administrations than for Republican administrations.

Drilling down further, we find that the degree to which partisanship is related to outcome varies by president. The George W. Bush Administration, Obama Administration, and first-term Trump Administration all perform fairly similarly in front of judges of either party, but the Clinton Administration and Biden Administration both performed markedly better in front of Democratic-appointed judges and markedly worse in front of Republican-appointed judges.