And, as empirical economics has progressed, the difficulty of doing so has grown. Reinhart and Rogoff may have used a relatively small set of mostly publicly available data, but the profession as a whole is using ever-larger tailor-made data sets.
试图复制这些研究发现的独立学者首先必须复制数据然后复制研究程序。而且，随着经济学经验研究的发展，这种复制研究发现的难度不断加大了。莱恩哈特和罗格夫可能使用了一组相对较小且大部分公开的数据，但整个行业都在使用不断增大的定制数据组。