query: What percentage of U.S. PhD candidates complete their dissertation?
passage: Doctor of Philosophy
Depending on the specific field of study, completion of a Ph.D. program usually takes four to eight years of study after the Bachelor's Degree; those students who begin a Ph.D. program with a master's degree may complete their Ph.D. degree a year or two sooner.[114] As Ph.D. programs typically lack the formal structure of undergraduate education, there are significant individual differences in the time taken to complete the degree. Overall, 57% of students who begin a Ph.D. program in the US will complete their degree within ten years, approximately 30% will drop out or be dismissed, and the remaining 13% of students will continue on past ten years.[115]
passage: Household income in the United States
According to the US Census Bureau persons with doctorates in the United States had an average income of roughly $81,400. The average for an advanced degree was $72,824, with men averaging $90,761 and women averaging $50,756 annually. Year-round full-time workers with a professional degree had an average income of $109,600 while those with a master's degree had an average income of $62,300. Overall, "…[a]verage earnings ranged from $18,900 for high school dropouts to $25,900 for high school graduates, $45,400 for college graduates and $99,300 for workers with professional degrees (M.D., O.D., D.P.T., D.P.M., D.O., J.D., Pharm.D., D.D.S., or D.V.M.).