In a monthly series of blog posts, Dr. Ranjit K. Singh explores ex-post harmonization: the art of combining data from different surveys. A new episode is now available:
Apples and Oranges: How to find out if two questions measure the same concept?
This month Dr. Singh delves into an important but difficult matter in harmonization in general and ex-post harmonization in particular: How can we determine if two instruments measure the same concept? This is especially hard if the concepts are latent (i.e., not directly observable).