Conditional Probability and Ratio‐based Approaches for Mapping the Coverage of Multi‐dose Vaccines

Many vaccines are often administered in multiple doses to boost their effectiveness. In the case of childhood vaccines, the coverage maps of the doses and the differences between these often constitute an evidence base to guide investments in improving access to vaccination services and health system performance in low and middle‐income countries. A major problem often encountered when mapping the coverage of multi‐dose vaccines is the need to ensure that the coverage maps decrease monotonically with successive doses. That is, for doses i$$ i $$ and j$$ j $$ , i