How does the MPI respond to changes over time?

We estimated the MPI for two or more data points for 61 countries for which suitable data were available. It seems that the MPI can be used to study the changes in poverty pattern over time providing that the data were available from the same survey conducted at different years. We advise the reader to carefully interpret the changes over time for a particular country because different indicators could be missing from the survey at different points in time (i.e. for Brazil, the 2006 data lacks information about cooking fuel while the 2012 and 2013 data lack information about nutrition and type of floor).