Data Decay and Data Amnesia: What a Survey Interruption Costs Global Health Surveillance in Sub-Saharan Africa (analysis code)

R analysis pipeline accompanying the manuscript Data Decay and Data Amnesia: What a Survey Interruption Costs Global Health Surveillance in Sub-Saharan Africa. Thirty scripts covering extraction of child mortality, fertility and programme coverage from 1,568 DHS recode files across 167 standard survey rounds in 38 sub-Saharan African countries, fieldwork 1986 to 2025; validation of every estimate against the DHS Program API; vintage truncation under strict zero-lookahead at four historical cutoffs; four forecast specifications scored on effective extrapolation distance; a recall-degradation analysis; an allocation exercise with bootstrap inference and constraint sensitivity; a reproducible citation audit; and the Multiple Indicator Cluster Survey observability counterfactual. Code only. No microdata, derived panels, figures or manuscript are included. DHS microdata are owned by The DHS Program, are licensed to the individual researcher, and cannot be redistributed. DATA.md in the archive documents every data source and how to obtain it.