Humanities Indicators
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I-9c: Percentage of Public High School Students in Classes Taught by an Instructor with a Postsecondary Degree in That Subject, for Selected Subjects, 1988–2012

* The Natural Science category aggregates teachers of general science and specific science disciplines (e.g., chemistry). Such teachers are considered to hold a credential in the subject they teach if the degree or certification is in general science or a specific science discipline.
** Data not collected for this subject in 1988.
! Interpret data with caution. The standard error for each of the estimates for this subject is between 30% and 50% of the estimated value.

Source: For years 1988–2000: Marilyn M. Seastrom et al., Qualifications of the Public School Teacher Workforce: Prevalence of Out-of-Field Teaching 1987–88 to 1999–2000, Statistical Analysis Report NCES 2002-603 Revised (Washington, DC: National Center for Education Statistics, 2002), 62 table B-9. For 2004: Beth A. Morton et al., Education and Certification Qualifications of Departmentalized Public High School–Level Teachers of Core Subjects: Evidence from the 2003–04 Schools and Staffing Survey, Statistical Analysis Report NCES 2008-338 (Washington, DC: National Center for Education Statistics, 2008), 27 table 5. For 2008: Jason G. Hill, Education and Certification Qualifications of Departmentalized Public High School–Level Teachers of Core Subjects: Evidence from the 2007–08 Schools and Staffing Survey, Statistical Analysis Report NCES 2011-317 (Washington, DC: National Center for Education Statistics, 2011), 20 table 5. For 2012: Jason Hill and Chelsea Stearns, Education and Certification Qualifications of Departmentalized Public High School–Level Teachers of Selected Subjects: Evidence from the 2011–12 Schools and Staffing Survey (Washington, DC: U.S. Government Printing Office, 2015), 29 table 7.

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