Hall, PeterMa, Yanyuan2015-12-071369-7412http://hdl.handle.net/1885/26179We consider functional measurement error models where the measurement error distribution is estimated non-parametrically. We derive a locally efficient semiparametric estimator but propose not to implement it owing to its numerical complexity. Instead, aKeywords: Errors in variables; Latent variables; Measurement error; Semiparametric efficiency; Semiparametric methods200710.1111/j.1467-9868.2007.00596.x2015-12-07