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academic outcomes addition assumption biased BLACK chapter coefficient estimates college degree college dropout college students competing risks model correlated CRDATT data set Descriptive Statistics differences drop dropout hazard dropout rate Dummy var equal earn EDASPGTC effect of employment effect on grades employment among college employment and dropout employment and grades enrolled error terms estimation results family income financial aid fixed effects estimate fixed effects model GPA equation grade cost grade point average graduation hazard hazard rate high school HISP hispanic hours a week HSB respondents HSDROP HSGPA HSHWHI HSHWLO includes increase influence student instrumental variables instruments labor market involvement leave school non-CWS number of credits number of hours OLS estimation OLS model PCTHRS percentage positively related RANDOM EFFECTS ESTIMATION random effects model related to dropout relationship between employment reported sample semester standard errors statistically significant student employment thirty hours tobit model transcript file tuition unobserved variables WORKSCH