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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 ...
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. ...