“…See their references for a list of examples, and Andrews (1995), Song (2008) and Sperlich (2009) for related results. Examples of semiparametric applications with generated covariates include Olley and Pakes (1996), Heckman, Ichimura, and Todd (1998), Li and Wooldridge (2002), Levinsohn and Petrin (2003), Blundell and Powell (2004), Linton, Sperlich, and Van Keilegom (2008), Rothe (2009), Escanciano, Jacho-Chávez, and Lewbel (2012) and Caetano, Rothe, and Yildiz (2014), among many others. Song (2013) studies a class of semiparametric models with generated covariates that have a single-index structure, and shows that adaptive estimation is possible in such models under weak conditions (see also Song (2012)).…”