Highlights -- Dialogue behind the scenes .............................. Michelle Liou  1059

Editorial -- Innovations in dealing with missing data or missing reports ............
   ..................................................................... Xiao-Li Meng  1061

Local quasi-likelihood estimation with data missing at random .......................
   ........................... Jianwei Chen, Jianqing Fan, Kim-Hung Li and Haibo Zhou  1071

An empirical likelihood method in mixture models with incomplete classifications ....
   ........................................................ Song Xi Chen and Jing Qin  1101

Analysis of nonlinear structural equation models with nonignorable missing covariates 
   and ordered categorical data ..................... Sik-Yum Lee and Nian-Sheng Tang  1117

Likelihood-based inference with nonignorable missing responses and covariates in 
   models for discrete longitudinal data ... Amy L. Stubbendick and Joseph G. Ibrahim  1143

Efficiencies of methods dealing with missing covariates in regression analysis ......
   ............................................... Cuiling Wang AND Myunghee Cho Paik  1169

A revisit of semiparametric regression models with missing data .....................
   .......................................................... Menggang Yu and Bin Nan  1193

Inferences in censored cost regression models with empirical likelihood ............. 
   ........................................ X. H. Zhou, G. S. Qin, H.Z. Lin and G. Li  1213

Robust nonparametric frontier estimators: qualitative robustness and influence 
   function .................................... Abdelaati Daouia and Anne Ruiz-Gazen  1233

Long-memory wavelet models ............................................. Nan-Jung Hsu  1255

A note on the lasso and related procedures in model selection ....................... 
   ............................................. Chenlei Leng, Yi Lin and Grace Wahba  1273

Connections among different criteria for asymmetrical fractional factorial designs ..
   ................................ Min-Qian Liu, Kai-Tai Fang and Fred J. Hickernell  1285

Unique optimal partitions of distributions and connections to hazard rates and 
   stochastic ordering .............................. David Mease and Vijayan N. Nair  1299

On the estimation and testing of time varying constraints in econometric models .....
   .................................. Susan Orbe, Eva Ferreira and Juan Rodriguez-Poo  1313

Strong limit theorems on model selection in generalized linear regression with 
   binomial responses ...................................... Guoqi Qian and Yuehua Wu  1335   

Modeling the subdistribution of a competing risk ....................................
   .......................... Liuquan Sun, Jingxia Liu, Jianguo Sun and Mei-Jie Zhang  1367

Two-way heteroscedastic ANOVA when the number of levels is large ....................
   .................................................. Lan Wang and Michael G. Akritas  1387

Exact convergence rate and leading term in the Central Limit Theorem for U-statistics 
   .................................................. Qiying Wang and Neville C Weber  1409

Additive coefficient modeling via polynomial spline ......... Lan Xue and Lijian Yang  1423

Errata ..............................................................................  1447


2006 Statistica Sinica ISSN 1017-0405