In the memorable words of Ragnar Frisch, econometrics is 'a unification of the theoretical-quantitative and the empirical-quantitative approach to economic problems'. Beginning to take shape in the 1930s and 1940s, econometrics is now recognized as a vital subdiscipline supported by a vast-and still rapidly growing-body of literature. Following the positive reception of The Rise of Econometrics (2013) (978-0-415-61678-2), Routledge now announces a new collection in its Critical Concepts in Economics series. Edited by the author of the field's leading textbook, Panel Data Econometrics brings together in one 'mini library' the best and most influential scholarship. This four-volume set provides an authoritative, one-stop resource to enable users to understand the econometrics of panel data, from both theoretical and applied viewpoints. With a full index and comprehensive introductions to each volume, newly written by the editor, the collection also provides a synoptic view of many current key debates and issues.