SECOND ORDER ASYMPTOTIC EFFICIENCY FOR Y=θ1+g(T)+ε
 
                 
                
                    
                                        
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Graphical Abstract
 
                                        
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Abstract
    In this paper, the authors oonstruot seoond order asymptotically effluent estimator of θ1 baaed on PMLB for the semiparametric regression model Y=θ+g(T)+ε, where T and ε are independent, g is unknown, the density function g(·) of ε is known with mean 0 and variance σ2
 
                                        
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