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treat Treatment indicator.
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Course The course id the student was enrolled in.
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Grade The course grade the student earned (4=A, 3=B, 2=C, 1=D, 0=F or W).
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Gender Gender of the student.
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Ethnicity Ethnicity of the student, either White, Black, or Other.
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Military Is the student an active military student.
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ESL English second language student.
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EdMother Education level of the mother (1 = did not finish high school;
2 = high school grad; 3 = some college; 4 = earned associate degree;
5 = earned baccalaureate degree; 6 = Earned Master's degree; 7 = earned doctorate).
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EdFather Education level of the father (levels same as EdMother).
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Age Age at the start of the course.
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Employment Employment level at college enrollment (1 = No; 2 = part-time;
3 = full-time).
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Income Household income level at college enrollment (1 = <25K; 2 = <35K; 3 = <45K;
4 = <55K; 5 = <70K; 6 = <85K; 7 = <100K; 8 = <120K; 9 = >120K).
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Transfer Number of transfer credits at the start of the course.
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GPA GPA as of the start of the course.
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GradeCode Letter grade.
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Level Level of the course, either Lower or Upper.
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ID Randomly assigned student ID.
a data frame with 17 variables.
providing 
.