“…Step i: define the order of the balances A type of balance V is defined consistent with the usual form of analysis in the WASH sector (Quispe-Coica and Pérez-Foguet, 2018. The first is between the proportion of households with access to improved (X 1 ) and unimproved (X 2 × X 3 ) services, and the second is between the proportion of households with access to other unimproved service (X 2 ) and X 3 .…”