These are the appendixes for the study, "Using High School Data to Predict College Readiness and Early College Success on Guåhan (Guam)." On Guåhan (Guam), the large percentages of students enrolling in non-credit-bearing courses at Kulehon Kumunidåt Guåhan (Guam Community College) and Unibetsedåt Guåhan (University of Guam) have raised concerns about college readiness and early college success. Without adequate research on predictors of college readiness and early success among students on Guåhan, educators and other stakeholders find it difficult to identify and support students at risk of being underprepared for college. This study examined which student characteristics predicted college readiness and early college success among students who graduated from Guåhan high schools and enrolled at Kulehon Kumunidåt Guåhan or Unibetsedåt Guåhan between 2012 and 2015. Four appendixes are included in the document: (1) Additional context for the study; (2) Methods; (3) Supporting analyses; and (4) Sensitivity analyses. [For the full report, see ED611775; for the study brief, see ED611778; for the study snapshot, see ED611779.]