The private student-loan sector continues to slowly improve, but defaults and delinquencies are still at elevated levels compared to the period before the financial crisis, according to a new report by analysts at DBRS, based on data from deals that closed between 2002 and 2007. Quarterly gross defaults, as measured as a percentage of loans in repayment, slipped from 1.07 percent in the third quarter of 2013 to 1.00 percent in the fourth quarter. Similarly, the percentage of gross defaults as a percentage of the original pool balance declined from 0.55 percent to 0.50 percent. “Defaults have remained...