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Data from the STAR (Student–Teacher Achievement Ratio) Project, a four-year longitudinal study examining the effect of class size in early grade levels on educational performance and personal development




A data frame with 6325 rows and 6 variables:

  • race: black or white

  • classtype: kindergarten class type: small, regular, regular with aid

  • yearssmall: number of years (0 to 4) in small classes

  • hsgrad: high-school graduation (graduated or not). NOTE: There are many NAs

  • g4math: total scaled score for the math portion of the fourth-grade standardized test

  • g4reading: total scaled score for the reading portion of the fourth-grade standardized test


  • Imai, Kosuke. 2017. Quantitative Social Science: An Introduction. Princeton University Press. URL from whence these data were added to this package.

  • Mosteller, Frederick. 1997. “The Tennessee Study of Class Size in the Early School Grades.” Bulletin of the American Academy of Arts and Sciences 50(7): 14-25. doi = 10.2307/3824562