Teacher attrition research

Nationally, schools lose between $1 billion and $2.2 billion in attrition costs each year through teachers moving or leaving the profession, according to new research. The result is a spiral of loss that affects high-poverty schools disproportionately.
Alliance for Excellent Education. (2014). On the Path to Equity: Improving the Effectiveness of Beginning Teachers.
http://all4ed.org/reports-factsheets/path-to-equity/