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Instrumental variables based on twin births are by definition not valid
(2018-04)
Instrumental variables based on twin births are a well-known and widespread method
to find exogenous variation in the number of children when studying the effect on
siblings or parents. This paper argues that there are ...
Mortality among European settlers in pre-colonial West Africa: The “White Man’s Grave” revisited
(2016-08)
We have created the first longitudinal dataset following European employees of the English Royal African Company during their time in West Africa, 1683–1766. The mortality was catastrophically high with limited geographical ...
Too LATE for Natural Experiments: A Critique of Local Average Treatment Effects Using the Example of Angrist and Evans (1998)
(2019-11)
There has been a fundamental flaw in the conceptual design of many natural experiments used in the economics literature, particularly among studies aiming to estimate a local average treatment effect (LATE). When we use ...
An introduction to using twin births as instrumental variables for sibship size
(2017-04)
Some families who experience a twin birth get one more child than they had intended and planned for. This is the reason why twin births are used to create instrumental variables (IVs) for the number of children in a family. ...