This document contains the appendixes for the full report, "Advanced Placement Participation, Staffing, and Staff Training in the District of Columbia Public Schools." The study examined students' AP exam taking and passing rates in schools that mandate AP course enrollment and in schools that do not, teacher participation in the Advanced Placement Summer Institute (APSI), and the alignment of AP teachers' college major with the AP course they teach. This appendix describes the data sources, sample, and analysis methods used to produce the descriptive statistics used to answer the study's research questions. The District of Columbia Public Schools (DCPS) provided the data used in this study. The data included student-level Advanced Placement (AP) enrollment data, which provided information on the students who enrolled in each AP course, the schools in which they did so, and the teacher who taught the course; student-level AP exam data, which provided information on whether students took or passed an AP exam; teacher-level characteristics data, which provided information on teachers' years of experience and college (undergraduate and graduate) major; and teacher-level Advanced Placement Summer Institute (APSI) participation data, which provided information on the teachers who attended the APSI and the course for which they did so. The appendixes include: (1) Methods; (2) Supporting analyses; and (3) Other analyses. [For the full report, see ED611751. For the study snapshot, see ED611754.]