Opinion writing in the federal district courts

American trial court judges' roles and behavior vary greatly from their appellate court brethren. One such area of difference has to do with opinion writing behavior, an area where trial judges hold a great deal of discretion in determining whether to write an opinion and, if they do, how long the opinion should be. To examine what factors determine opinion writing behavior among district court judges, this study relies on analyses of an original dataset of civil cases that terminated in eighteen federal district courts from 2000 to 2006. The results indicate that legal, hierarchical, and institutional features are critical in motivating opinion writing and opinion length and that personal factors have very limited effects. The fruits of this exercise have important implications for how we view and model the behavior of trial court judges in the future.