# Biometrika Trust

# Biometrika

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Web page: http://biomet.oxfordjournals.org/

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Fax: 01865 267 985

Web page: http://biomet.oxfordjournals.org/

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**Series handle:**repec:oup:biomet

**ISSN:**0006-3444

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### 2012, Volume 99, Issue 1

**238-244 On robust estimation via pseudo-additive information***by*Davide Ferrari & Davide La Vecchia**245-251 Optimality of group testing in the presence of misclassification***by*Aiyi Liu & Chunling Liu & Zhiwei Zhang & Paul S. Albert

### 2011, Volume 98, Issue 4

**761-774 Non-Gaussian spatiotemporal modelling through scale mixing***by*Thaís C. O. Fonseca & Mark F. J. Steel**775-789 Nonparametric estimation of the variogram and its spectrum***by*Chunfeng Huang & Tailen Hsing & Noel Cressie**791-806 Square-root lasso: pivotal recovery of sparse signals via conic programming***by*A. Belloni & V. Chernozhukov & L. Wang**807-820 Sparse estimation of a covariance matrix***by*Jacob Bien & Robert J. Tibshirani**821-830 Forward adaptive banding for estimating large covariance matrices***by*Chenlei Leng & Bo Li**831-843 The Aalen additive gamma frailty hazards model***by*Torben Martinussen & Thomas H. Scheike & David M. Zucker**845-860 Optimizing randomized trial designs to distinguish which subpopulations benefit from treatment***by*M. Rosenblum & M. J. van der Laan**861-875 Covariate selection for the nonparametric estimation of an average treatment effect***by*Xavier De Luna & Ingeborg Waernbaum & Thomas S. Richardson**877-886 A goodness-of-fit test of logistic regression models for case-control data with measurement error***by*Ganggang Xu & Suojin Wang**887-900 Threshold estimation based on a p-value framework in dose-response and regression settings***by*A. Mallik & B. Sen & M. Banerjee & G. Michailidis**901-918 Estimation of latent factors for high-dimensional time series***by*Clifford Lam & Qiwei Yao & Neil Bathia**919-934 Quantifying the failure of bootstrap likelihood ratio tests***by*Mathias Drton & Benjamin Williams**935-951 Elliptical graphical modelling***by*D. Vogel & R. Fried**953-966 Inverse probability weighting for clustered nonresponse***by*C. J. Skinner & D'arrigo**967-978 Blocking, efficiency and weighted optimality***by*Xiaowei Wang & J. P. Morgan**979-985 False discovery rate for scanning statistics***by*D. O. Siegmund & N. R. Zhang & B. Yakir**987-994 Likelihood analysis of the binary instrumental variable model***by*R. R. Ramsahai & S. L. Lauritzen**995-999 Wild bootstrap for quantile regression***by*Xingdong Feng & Xuming He & Jianhua Hu**1001-1006 Empirical likelihood and quantile regression in longitudinal data analysis***by*Cheng Yong Tang & Chenlei Leng**1007-1014 Generalized linear time series regression***by*Enno Mammen & Jens Perch Nielsen & Bernd Fitzenberger

### 2011, Volume 98, Issue 3

**503-518 Sample size formulae for two-stage randomized trials with survival outcomes***by*Zhiguo Li & Susan A. Murphy**519-535 The covariate-adaptive biased coin design for balancing clinical trials in the presence of prognostic factors***by*A. Baldi Antognini & M. Zagoraiou**537-551 Bayesian isotonic density regression***by*Lianming Wang & David B. Dunson**553-566 A class of mixtures of dependent tail-free processes***by*A. Jara & T. E. Hanson**567-582 Semiparametric inference in mixture models with predictive recursion marginal likelihood***by*Ryan Martin & Surya T. Tokdar**583-598 Functional mixed effects spectral analysis***by*Robert T. Krafty & Martica Hall & Wensheng Guo**599-614 Testing parametric assumptions of trends of a nonstationary time series***by*Ting Zhang & Wei Biao Wu**615-631 Aggregation-cokriging for highly multivariate spatial data***by*Reinhard Furrer & Marc G. Genton**633-645 A construction principle for multivariate extreme value distributions***by*F. Ballani & M. Schlather**647-662 Marginal methods for correlated binary data with misclassified responses***by*Zhijian Chen & Grace Y. Yi & Changbao Wu**663-684 Efficient restricted estimators for conditional mean models with missing data***by*Z. Tan**685-700 Conditional Akaike information under generalized linear and proportional hazards mixed models***by*M. C. Donohue & R. Overholser & R. Xu & F. Vaida**701-710 Generalized varying coefficient models with unknown link function***by*C. N. Kuruwita & K. B. Kulasekera & C. M. Gallagher**711-720 Sudoku-based space-filling designs***by*Xu Xu & BEN Haaland & Peter Z. G. Qian**721-731 Nested orthogonal array-based Latin hypercube designs***by*Xu He & Peter Z. G. Qian**733-739 Robust designs through partially clear two-factor interactions***by*Ryan Lekivetz & Boxin Tang**741-747 Construction of φ p -optimal exact designs with minimum experimental run size for a linear log contrast model in mixture experiments***by*Baisuo Jin & Mong-Na Lo Huang**749-754 On protected estimation of an odds ratio model with missing binary exposure and confounders***by*E. J. Tchetgen Tchetgen & A. Rotnitzky**755-759 Multinomial logit bias reduction via the Poisson log-linear model***by*Ioannis Kosmidis & David Firth

### 2011, Volume 98, Issue 2

**251-271 False discovery rates and copy number variation***by*Bradley Efron & Nancy R. Zhang**273-290 Sample size and power analysis for sparse signal recovery in genome-wide association studies***by*Jichun Xie & T. Tony Cai & Hongzhe Li**291-306 Sparse Bayesian infinite factor models***by*A. Bhattacharya & D. B. Dunson**307-323 Bayesian influence analysis: a geometric approach***by*Hongtu Zhu & Joseph G. Ibrahim & Niansheng Tang**325-340 Nonparametric inference for competing risks current status data with continuous, discrete or grouped observation times***by*M. H. Maathuis & M. G. Hudgens**341-354 Time-dependent cross ratio estimation for bivariate failure times***by*Tianle Hu & Bin Nan & Xihong Lin & James M. Robins**355-370 Efficient semiparametric regression for longitudinal data with nonparametric covariance estimation***by*Yehua Li**371-380 Sure independence screening and compressed random sensing***by*Lingzhou Xue & Hui Zou**381-390 Testing against a high-dimensional alternative in the generalized linear model: asymptotic type I error control***by*Jelle J. Goeman & Hans C. van Houwelingen & Livio Finos**391-401 The union closure method for testing a fixed sequence of families of hypotheses***by*Han-Joo Kim & A. Richard Entsuah & Justine Shults**403-416 Maximum smoothed likelihood for multivariate mixtures***by*M. Levine & D. R. Hunter & D. Chauveau**417-431 Distribution estimators and confidence intervals for stereological volumes***by*Peter Hall & Johanna Ziegel**433-448 Maximum likelihood estimation of a generalized threshold stochastic regression model***by*Noelle I. Samia & Kung-Sik Chan**449-458 Optimal design for additive partially nonlinear models***by*S. Biedermann & H. Dette & D. C. Woods**459-471 On balanced random imputation in surveys***by*G. Chauvet & J.-C. Deville & D. Haziza**473-480 Empirical likelihood for small area estimation***by*Sanjay Chaudhuri & Malay Ghosh**481-488 On the likelihood function of Gaussian max-stable processes***by*Marc G. Genton & Yanyuan Ma & Huiyan Sang**489-494 The dimple in Gneiting's spatial-temporal covariance model***by*John T. Kent & Mohsen Mohammadzadeh & Ali M. Mosammam**495-501 An Akaike-type information criterion for model selection under inequality constraints***by*R. M. Kuiper & H. Hoijtink & M. J. Silvapulle

### 2011, Volume 98, Issue 1

**1-15 Joint estimation of multiple graphical models***by*Jian Guo & Elizaveta Levina & George Michailidis & Ji Zhu**17-34 The multivariate beta process and an extension of the Polya tree model***by*Lorenzo Trippa & Peter Müller & Wesley Johnson**35-48 Bayesian geostatistical modelling with informative sampling locations***by*D. Pati & B. J. Reich & D. B. Dunson**49-63 Bootstrap inference for mean reflection shape and size-and-shape with three-dimensional landmark data***by*S. P. Preston & Andrew T. A. Wood**65-80 Particle approximations of the score and observed information matrix in state space models with application to parameter estimation***by*George Poyiadjis & Arnaud Doucet & Sumeetpal S. Singh**81-90 A self-normalized confidence interval for the mean of a class of nonstationary processes***by*Zhibiao Zhao**91-106 On asymptotic normality and variance estimation for nondifferentiable survey estimators***by*Jianqiang C. Wang & J. D. Opsomer**107-118 Horvitz--Thompson estimators for functional data: asymptotic confidence bands and optimal allocation for stratified sampling***by*Hervé Cardot & Etienne Josserand**119-132 Parametric fractional imputation for missing data analysis***by*Jae Kwang Kim**133-146 Partial envelopes for efficient estimation in multivariate linear regression***by*Zhihua Su & R. Dennis Cook**147-162 Estimation of covariate effects in generalized linear mixed models with informative cluster sizes***by*John M. Neuhaus & Charles E. McCulloch**163-175 A unified framework for studying parameter identifiability and estimation in biased sampling designs***by*Hua Yun Chen**177-186 Nonparametric estimation for length-biased and right-censored data***by*Chiung-Yu Huang & Jing Qin**187-198 Variance estimation for generalized Cavalieri estimators***by*Johanna Ziegel & Eva B. Vedel Jensen & Karl-Anton Dorph-Petersen**199-214 The effect of correlation in false discovery rate estimation***by*Armin Schwartzman & Xihong Lin**215-224 Assessing the validity of weighted generalized estimating equations***by*A. Qu & G. Y. Yi & P. X.-K. Song & P. Wang**225-230 Data-driven selection of the spline dimension in penalized spline regression***by*Göran Kauermann & Jean D. Opsomer**231-236 A novel reversible jump algorithm for generalized linear models***by*M. Papathomas & P. Dellaportas & V. G. S. Vasdekis**237-242 Recapture models under equality constraints for the conditional capture probabilities***by*A. Farcomeni**243-250 Testing a linear time series model against its threshold extension***by*Guodong Li & Wai Keung Li

### 2010, Volume 97, Issue 4

**773-789 On the behaviour of marginal and conditional AIC in linear mixed models***by*Sonja Greven & Thomas Kneib**791-805 Additive modelling of functional gradients***by*Hans-Georg Müller & Fang Yao**807-824 Most-predictive design points for functional data predictors***by*F. Ferraty & P. Hall & P. Vieu**825-838 Noncrossing quantile regression curve estimation***by*Howard D. Bondell & Brian J. Reich & Huixia Wang**839-850 Censored quantile regression with partially functional effects***by*Jing Qian & Limin Peng**851-865 Nonparametric Bayesian density estimation on manifolds with applications to planar shapes***by*Abhishek Bhattacharya & David B. Dunson**867-880 A weighted estimating equation approach for inhomogeneous spatial point processes***by*Yongtao Guan & Ye Shen**881-892 Bootstrap confidence intervals and hypothesis tests for extrema of parameters***by*Peter Hall & Hugh Miller**893-904 Consistent selection of the number of clusters via crossvalidation***by*Junhui Wang**905-920 Penalized high-dimensional empirical likelihood***by*Cheng Yong Tang & Chenlei Leng**921-934 Estimation of controlled direct effects on a dichotomous outcome using logistic structural direct effect models***by*Stijn Vansteelandt**935-946 Compound optimal allocation for individual and collective ethics in binary clinical trials***by*Alessandro Baldi Antognini & Alessandra Giovagnoli**947-960 Enhancing the sample average approximation method with U designs***by*Qi Tang & Peter Z. G. Qian**961-968 Probability-based Latin hypercube designs for slid-rectangular regions***by*Ying Hung & Yasuo Amemiya & Chien-Fu Jeff Wu**969-976 Varying coefficient transformation models with censored data***by*Kani Chen & Xingwei Tong**977-984 On the Voronoi estimator for the intensity of an inhomogeneous planar Poisson process***by*C. D. Barr & F. P. Schoenberg**985-989 Some insights into continuum regression and its asymptotic properties***by*Xin Chen & R. Dennis Cook**990-996 On the equivalence of prospective and retrospective likelihood methods in case-control studies***by*Ana-Maria Staicu**997-1001 A note on overadjustment in inverse probability weighted estimation***by*Andrea Rotnitzky & Lingling Li & Xiaochun Li**1002-1005 Parameter redundancy with covariates***by*Diana J. Cole & Byron J. T. Morgan**1006-1012 Marginal log-linear parameterization of conditional independence models***by*Tamás Rudas & Wicher P. Bergsma & Renáta Németh**1013-1013 Amendments and Corrections***by*Soumik Pal

### 2010, Volume 97, Issue 3

**519-538 Penalized likelihood methods for estimation of sparse high-dimensional directed acyclic graphs***by*Ali Shojaie & George Michailidis**539-550 A new approach to Cholesky-based covariance regularization in high dimensions***by*Adam J. Rothman & Elizaveta Levina & Ji Zhu**551-566 Penalized Bregman divergence for large-dimensional regression and classification***by*Chunming Zhang & Yuan Jiang & Yi Chai**567-584 Shape curves and geodesic modelling***by*Kim Kenobi & Ian L. Dryden & Huiling Le**585-601 A class of grouped Brunk estimators and penalized spline estimators for monotone regression***by*Xiao Wang & Jinglai Shen**603-620 On the asymptotic behaviour of the pseudolikelihood ratio test statistic with boundary problems***by*Yong Chen & Kung-Yee Liang**621-630 Accurate and robust tests for indirect inference***by*Veronika Czellar & Elvezio Ronchetti**631-645 Detecting simultaneous changepoints in multiple sequences***by*Nancy R. Zhang & David O. Siegmund & Hanlee Ji & Jun Z. Li**647-659 Sufficient cause interactions for categorical and ordinal exposures with three levels***by*Tyler J. Vanderweele**661-682 Bounded, efficient and doubly robust estimation with inverse weighting***by*Zhiqiang Tan**683-698 Analysis of cohort studies with multivariate and partially observed disease classification data***by*Nilanjan Chatterjee & Samiran Sinha & W. Ryan Diver & Heather Spencer Feigelson**699-712 A semiparametric additive rate model for recurrent events with an informative terminal event***by*Donglin Zeng & Jianwen Cai**713-726 Attributable fraction functions for censored event times***by*Li Chen & D. Y. Lin & Donglin Zeng**727-740 Estimating species richness by a Poisson-compound gamma model***by*Ji-Ping Wang**741-755 Properties of nested sampling***by*Nicolas Chopin & Christian P. Robert**757-764 Empirical likelihood methods for two-dimensional shape analysis***by*Getulio J. A. Amaral & Andrew T. A. Wood**765-772 Strictly stationary solutions of autoregressive moving average equations***by*Peter J. Brockwell & Alexander Lindner

### 2010, Volume 97, Issue 2

**261-278 Variable selection in high-dimensional linear models: partially faithful distributions and the pc -simple algorithm***by*P. Bühlmann & M. Kalisch & M. H. Maathuis**279-294 Dimension reduction for non-elliptically distributed predictors: second-order methods***by*Yuexiao Dong & Bing Li**295-304 Sufficient dimension reduction through discretization-expectation estimation***by*Liping Zhu & Tao Wang & Lixing Zhu & Louis Ferré**305-319 Semiparametric dimension reduction estimation for mean response with missing data***by*Zonghui Hu & Dean A. Follmann & Jing Qin**321-332 On the relative efficiency of using summary statistics versus individual-level data in meta-analysis***by*D. Y. Lin & D. Zeng**333-345 Evidence factors in observational studies***by*Paul R. Rosenbaum**347-360 A theory for testing hypotheses under covariate-adaptive randomization***by*Jun Shao & Xinxin Yu & Bob Zhong**361-374 Efficient estimation in multi-phase case-control studies***by*A. J. Lee & A. J. Scott & C. J. Wild**375-388 Risk-adjusted monitoring of time to event***by*A. Gandy & J. T. Kvaløy & A. Bottle & F. Zhou**389-404 Calibrating parametric subject-specific risk estimation***by*T. Cai & L. Tian & Hajime Uno & Scott D. Solomon & L. J. Wei**405-418 Interval estimation for drop-the-losers designs***by*Samuel S. Wu & Weizhen Wang & Mark C. K. Yang**419-433 Efficient scalable schemes for monitoring a large number of data streams***by*Y. Mei**435-446 Estimating linear dependence between nonstationary time series using the locally stationary wavelet model***by*J. Sanderson & P. Fryzlewicz & M. W. Jones**447-464 A sequential smoothing algorithm with linear computational cost***by*Paul Fearnhead & David Wyncoll & Jonathan Tawn**465-480 The horseshoe estimator for sparse signals***by*Carlos M. Carvalho & Nicholas G. Polson & James G. Scott**481-496 Likelihood ratio statistics based on an integrated likelihood***by*T. A. Severini**497-504 Objective Bayes and conditional inference in exponential families***by*Thomas J. Diciccio & G. Alastair Young**505-512 Copula inference under censoring***by*M. L. Lakhal-Chaieb**513-518 Optimal designs for the emax, log-linear and exponential models***by*H. Dette & C. Kiss & M. Bevanda & F. Bretz

### 2010, Volume 97, Issue 1

**1-13 Systematic sampling with errors in sample locations***by*Johanna Ziegel & Adrian Baddeley & Karl-Anton Dorph-Petersen & Eva B. Vedel Jensen**15-30 Cross-covariance functions for multivariate random fields based on latent dimensions***by*Tatiyana V. Apanasovich & Marc G. Genton**31-48 Incorporating prior probabilities into high-dimensional classifiers***by*Peter Hall & Jing-Hao Xue**49-64 Functional quadratic regression***by*Fang Yao & Hans-Georg Müller**65-78 Marginal analyses of longitudinal data with an informative pattern of observations***by*D. M. Farewell**79-93 Generalized empirical likelihood methods for analyzing longitudinal data***by*Suojin Wang & Lianfen Qian & Raymond J. Carroll**95-108 On the use of stochastic ordering to test for trend with clustered binary data***by*Aniko Szabo & E. Olusegun George**109-121 Stochastic approximation with virtual observations for dose-finding on discrete levels***by*Ying Kuen Cheung & Mitchell S. V. Elkind**123-132 Sharp bounds on causal effects in case-control and cohort studies***by*Manabu Kuroki & Zhihong Cai & Zhi Geng**133-145 A semiparametric random effects model for multivariate competing risks data***by*Thomas H. Scheike & Yanqing Sun & Mei-Jie Zhang & Tina Kold Jensen**147-158 Estimation of the retransformed conditional mean in health care cost studies***by*Huixia Judy Wang & Xiao-Hua Zhou**159-170 Mean loglikelihood and higher-order approximations***by*N. Reid & D. A. S. Fraser**171-180 On doubly robust estimation in a semiparametric odds ratio model***by*Eric J. Tchetgen Tchetgen & James M. Robins & Andrea Rotnitzky**181-198 On Bayesian testimation and its application to wavelet thresholding***by*Felix Abramovich & Vadim Grinshtein & Athanasia Petsa & Theofanis Sapatinas**199-208 Forecasting for quantile self-exciting threshold autoregressive time series models***by*Yuzhi Cai**209-214 A note on the sensitivity to assumptions of a generalized linear mixed model***by*D. R. Cox & M. Y. Wong**215-222 Pseudo-score confidence intervals for parameters in discrete statistical models***by*Alan Agresti & Euijung Ryu**223-230 Global and local spectral-based tests for periodicities***by*L. Wei & P. F. Craigmile**231-237 Weighted least squares approximate restricted likelihood estimation for vector autoregressive processes***by*Willa W. Chen & Rohit S. Deo**238-245 Nonparametric Bayesian inference for the spectral density function of a random field***by*Yanbing Zheng & Jun Zhu & Anindya Roy**246-253 The distribution-based p-value for the outlier sum in differential gene expression analysis***by*Lin-An Chen & Dung-Tsa Chen & Wenyaw Chan**254-259 The maximal data piling direction for discrimination***by*Jeongyoun Ahn & J. S. Marron

### 2009, Volume 96, Issue 4

**761-780 Sinh-arcsinh distributions***by*M. C. Jones & Arthur Pewsey**781-792 A new look at time series of counts***by*Yunwei Cui & Robert Lund**793-804 Bias reduction in exponential family nonlinear models***by*Ioannis Kosmidis & David Firth**805-820 Inference on population size in binomial detectability models***by*R. M. Fewster & P. E. Jupp**821-834 Bayesian analysis of matrix normal graphical models***by*Hao Wang & Mike West**835-845 Bayesian lasso regression***by*Chris Hans**847-860 Generalized fiducial inference for wavelet regression***by*Jan Hannig & Thomas C. M. Lee**861-872 Nonparametric estimation of the probability of illness in the illness-death model under cross-sectional sampling***by*M. Mandel & R. Fluss**873-886 Nonparametric estimation for right-censored length-biased data: a pseudo-partial likelihood approach***by*Xiaodong Luo & Wei Yann Tsai**887-901 Marginal hazards model for case-cohort studies with multiple disease outcomes***by*S. Kang & J. Cai**903-915 Tests and confidence intervals for secondary endpoints in sequential clinical trials***by*Tze Leung Lai & Mei-Chiung Shih & Zheng Su**917-932 A unified approach to linearization variance estimation from survey data after imputation for item nonresponse***by*Jae Kwang Kim & J. N. K. Rao**933-944 Some design properties of a rejective sampling procedure***by*Wayne A. Fuller**945-956 Sliced space-filling designs***by*Peter Z. G. Qian & C. F. Jeff Wu**957-970 Nested Latin hypercube designs***by*Peter Z. G. Qian**971-974 Construction of orthogonal Latin hypercube designs***by*Fasheng Sun & Min-Qian Liu & Dennis K. J. Lin**975-982 Maximum likelihood estimation using composite likelihoods for closed exponential families***by*Kanti V. Mardia & John T. Kent & Gareth Hughes & Charles C. Taylor**983-990 Adaptive approximate Bayesian computation***by*Mark A. Beaumont & Jean-Marie Cornuet & Jean-Michel Marin & Christian P. Robert**991-997 Semiparametric methods for evaluating risk prediction markers in case-control studies***by*Ying Huang & Margaret Sullivan Pepe**998-1004 A note on the variance of doubly-robust G-estimators***by*E. E. M. Moodie**1005-1011 A note on automatic variable selection using smooth-threshold estimating equations***by*Masao Ueki**1012-1018 A note on adaptive Bonferroni and Holm procedures under dependence***by*Wenge Guo**1019-1023 A note on a conjectured sharpness principle for probabilistic forecasting with calibration***by*Soumik Pal**1024-1024 Generalized method of moments estimation for linear regression with clustered failure time data***by*Hui Li & Guosheng Yin

### 2009, Volume 96, Issue 3

**497-512 Objective Bayesian model selection in Gaussian graphical models***by*C. M. Carvalho & J. G. Scott**513-527 Adaptive regularization using the entire solution surface***by*S. Wu & X. Shen & C. J. Geyer**529-544 Asymptotic properties of penalized spline estimators***by*Gerda Claeskens & Tatyana Krivobokova & Jean D. Opsomer**545-558 Empirical Bayes estimation for additive hazards regression models***by*Debajyoti Sinha & M. Brent McHenry & Stuart R. Lipsitz & Malay Ghosh**559-575 Improving point and interval estimators of monotone functions by rearrangement***by*V. Chernozhukov & I. Fernández-Val & A. Galichon**577-590 Induced smoothing for the semiparametric accelerated failure time model: asymptotics and extensions to clustered data***by*Lynn M. Johnson & Robert L. Strawderman**591-600 Weighted Breslow-type and maximum likelihood estimation in semiparametric transformation models***by*Yi-Hau Chen**601-615 Pseudo-partial likelihood for proportional hazards models with biased-sampling data***by*Wei Yann Tsai**617-633 Pseudo-partial likelihood estimators for the Cox regression model with missing covariates***by*Xiaodong Luo & Wei Yann Tsai & Qiang Xu**635-644 Approximating the α-permanent***by*S. C. Kou & P. McCullagh**645-661 Markov models for accumulating mutations***by*N. Beerenwinkel & S. Sullivant**663-676 Gaussian process emulation of dynamic computer codes***by*S. Conti & J. P. Gosling & J. E. Oakley & A. O'Hagan**677-690 Optimal repeated measurement designs for a model with partial interactions***by*P. Druilhet & W. Tinsson**691-709 Use of functionals in linearization and composite estimation with application to two-sample survey data***by*C. Goga & J.-C. Deville & A. Ruiz-Gazen**711-722 Effects of data dimension on empirical likelihood***by*Song Xi Chen & Liang Peng & Ying-Li Qin**723-734 Improving efficiency and robustness of the doubly robust estimator for a population mean with incomplete data***by*Weihua Cao & Anastasios A. Tsiatis & Marie Davidian