Is Janice Rodgers Brown a liberal judge?

Todd Zwycki comments on a study of decisions by six judges who are considered Supreme Court possibilities. The ranking from the study is not what I would have expected with Janice Rodgers Brown the least conservative and Wilkinson the most.

Judge	Composite Ideology
Janice Rodgers Brown (SCOCA)	59.9
Frank Easterbrook	68.8
Emilio Garza	70.4
Edith Jones	71.3
J. Michael Luttig	68.2
J. Harvie Wilkinson	79.5
U.S. Court of Appeals Average	64.4

There are three components: criminal justice, civil rights and liberties, and economic and labor regulation. It may be that Janice Rodgers Brown's score reflects different sorts of cases heard in California's Supreme Court or perhaps just different law being applied.