Work Notes ========== DHD20160830 Main remaining tasks (including unit tests for all code): 1) Analyse segmented data. [DHD20180830 done 1s pass] 2) Analyse across groups of households, with confidence estimate. 3) Extract (pd) data from combined dump using secondary ID. 3a) Make map from primary ID + groups containing house,valve1ID,valve2ID 4) Draft preliminary test report, including notes from prior dry run. 5) Await NPL feedback and prepare final report.