# Dipartimento di Statistica, Probabilità e Statistiche Applicate - University of Rome

# Metron - International Journal of Statistics

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### 2011, Volume LXIX, Issue 1

**1-28 Corrado Gini: the man and the scientist***by*Giovanni Maria Giorgi**29-43 On the interpolation of a straight line when the values of the independent variable are affected by accidental errors***by*Corrado Gini**45-65 Corrado Gini, a pioneer in balanced sampling and inequality theory***by*Matti Langel & Yves Tillé**67-99 Gini’s multiple regressions: two approaches and their interaction***by*Edna Schechtman & Shlomo Yitzhaki & Taina Pudalov**101-117 Gini’s criticisms to the theory of inference: a missed opportunity***by*Ludovico Piccinato

### 2010, Volume LXVIII, Issue 3

**201-234 Multivariate extended skew-t distributions and related families***by*Reinaldo B. Arellano-Valle & Marc G. Genton**235-250 On Fisher information matrices and profile log-likelihood functions in generalized skew-elliptical models***by*Christophe Ley & Davy Paindaveine**251-263 Modelling conditional heteroskedasticity and skewness using the skew-normal distribution***by*Thomas R. Allen Corns & Stephen E. Satchell**265-273 Some moment properties of skew-symmetric circular distributions***by*Dale Umbach & Sreenivas Rao Jammalamadaka**275-298 Invariance-based estimating equations for skew-symmetric distributions***by*Adelchi Azzalini & Marc G. Genton & Bruno Scarpa**299-308 On the approximation of the tail probability of the scalar skew-normal distribution***by*Antonella Capitanio**309-329 Selection bias in linear mixed models***by*Leonardo Grilli & Carla Rampichini**331-345 Truncated skew-normal distributions: moments, estimation by weighted moments and application to climatic data***by*Cedric Flecher & Denis Allard & Philippe Naveau**347-369 A prospective combination of phase II and phase III in drug development***by*Adelchi Azzalini & Antonella Bacchieri**371-386 On the information matrix of the multivariate skew-t model***by*Reinaldo B. Arellano-Valle

### 2010, Volume LXVIII, Issue 2

**111-125 A pretest for choosing between logrank and Wilcoxon tests in the two-sample problem***by*Ruvie Lou Maria C. Martinez & Joshua D. Naranjo**127-136 Order statistics from a family of J-shaped distributions***by*Ahmad A. Zghoul**137-151 Speeding up the asymptotics when constructing one-sided coverage intervals with survey data***by*Phillip S. Kott & Yan K. LIU**153-160 Length biased weighted residual inaccuracy measure***by*Vikas Kumar & H.C. Taneja & R. Srivastava**161-183 Clustering multivariate time series by genetic multiobjective optimization***by*S. Bandyopadhyay & R. Baragona & U. Maulik**185-196 Improvement in estimating the population mean using two-stage balanced groups ranked set sampling***by*Amer Ibrahim Al-Omari & Mohammad Fraiwan Al-Saleh

### 2010, Volume LXVIII, Issue 1

**1-21 Estimating function approach for CHARN Models***by*Hiroomi Kanai & Hiroaki Ogata & Masanobu Taniguchi**23-46 Bonferroni and Gini indices for various parametric families of distributions***by*Giovanni Maria Giorgi & Saralees Nadarajah**47-65 A general procedure for estimating the population mean in stratified sampling using auxiliary information***by*Housila P. Singh & Gajendra K. Vishwakarma**67-75 Variance residual life function in discrete random ageing***by*M. Khorashadizadeh & A. H. Rezaei Roknabadi & G. R. Mohtashami Borzadaran**77-85 Characterization of discrete distributions by conditional variance***by*Kumar Kattumannil Sudheesh & N. Unnikrishnan Nair**87-94 On the identifiability of a mixture model for ordinal data***by*Maria Iannario**95-103 On stochastic optimization in sample allocation among strata***by*Marcin Kozak & Hai Ying Wang**105-110 Book reviews. Prevost "A total science: statistics in liberal and fascist Italy"***by*Giovanni Maria Giorgi

### 2009, Volume LXVII, Issue 3

**229-241 Transvariation and inequality between subpopulations in the Dagum’s Gini index decomposition***by*Michele Costa**243-255 Optimum quadratic three-step stress plans for log-logistic distribution***by*Mohammed Al-Haj Ebrahem & Abedel-Qader Al-Masri**257-267 On non-isomorphic orthogonal array OA(3^5,20,3,3)***by*Veena Budhraja & Seema Gupta**269-288 Bayesian analysis for the exponentiated Rayleigh distribution***by*Mohammad Z. Raqab & Mohamed T. Madi**289-301 Quantile estimation and the statistical relative efficiency curve***by*Vytaras Brazauskas**303-323 On a construction of Markov models in continuous time***by*Ramses H. Mena & Stephen G. Walker**325-337 An improved skewness measure***by*Richard A. Groeneveld & Glen Meeden

### 2009, Volume LXVII, Issue 2

**105-128 Mixture Designs in orthogonal blocks using F-squares***by*M. L. Aggarwal & Poonam Singh & Vandana Sarin & Bushra Husain**129-152 On the Polya-Aeppli regression model***by*Carlo Ferreri**153-175 Multivariate indirect methods of estimation in presence of non-response in successive sampling***by*Housila P. Singh & Sunil Kumar**177-200 Nonparametric estimation of regression parameters in measurement error models***by*A. K. MD. Ehsanes Saleh & Jan Picek & Jan Kalina**201-209 On the existence of a posterior distribution for spatial mixed models with binomial responses***by*Martin Vogt & Ralf Munnich**211-227 Mixture Designs in orthogonal blocks using F-squares***by*Mahendra Kumar Sharma & Sileshi Fanta

### 2009, Volume LXVII, Issue 1

**1-16 Bayes prediction of the regression coefficient in a finite population using balanced loss function***by*Ashok K. Bansal & Priyanka Aggarwal**17-30 Robust inference in composite transformation models***by*Luca Greco & Laura Ventura**31-50 Estimation of the Weibull shape parameter in failure censored sampling under the linex loss***by*Gyan Prakash & Dinesh Chandra Singh**51-56 On characterizations of t2 distribution by regressional properties of maximums***by*I. Akhundov & V. B. Nevzorov**57-74 Analysis of simple linear regression via median ranked set sampling***by*M. T. Alodat & M. Y. Al-Rawwash & I. M. Nawajah**75-86 On the power generalizedWeibull family: model for cancer censored data***by*Mikhail Nikulin & Firoozeh Haghighi**87-103 Estimation of population mean on current occasion in two-occasion successive sampling***by*Garib Nath Singh & Jaishree Prabha Karna

### 2008, Volume LXVI, Issue 3

**265-283 Attenuation of relative poverty by taxes and subsidies***by*K. Mosler & C. Scheicher**285-298 Mean squared error matrix comparison of least aquares and Stein-rule estimators for regression coefficients under non-normal disturbances***by*Shalabh & H. Toutenburg & C. Heumann**299-311 Size-biased Poisson-Lindley distribution and its application***by*M. E. Ghitany & D. K. Al-Mutairi**313-327 Two-stage restricted adaptive cluster sampling***by*E. Rocco**329-339 Unbiased variance estimation in estimating P (X > Y) for one and two parameter exponential populations***by*S. Sengupta**341-360 Method of trimmed moments for robust fitting of parametric failure time models***by*R. Bajorunaite & V. Brazauskas

### 2008, Volume LXVI, Issue 2

**135-155 Distributions of scan statistics in a sequence of Markov Bernoulli trials***by*R. L. Shinde & K. S. Kotwal,**157-181 Using Markov chains for marginal modelling of binary longitudinal data in an exact likelihood approach***by*M. H. Goncalves & A. Azzalini**183-204 Imputing and jackknifing scrambled responses***by*S. Singh – & J.-M. Kim & I. Singh Grewal**205-208 The distribution of the sum of a normal and a t random variable with arbitrary degrees of freedom***by*G. Forchini**209-221 On auto-regression type dynamic mixed models for binary panel data***by*B. C. Sutradhar**223-242 The role of lower partial moments in stochastic modeling***by*S. M. Sunoj & S. S. Maya**243-252 Comments on a-decomposability***by*N. Bouzar & S. Satheesh**253-262 Accounting for interviewer variability in small area estimation***by*B. Liu

### 2008, Volume LXVI, Issue 1

**1-3 Methodological advances in official statistics***by*Mauro Scanu (Guest Ed.)**5-20 Another look at ridge calibration***by*Jean-Francois Beaumont & Cynthia Bocci**21-49 Towards small area estimation at Statistics Netherlands***by*Harm Jan Boonstra & Jan A. Van Den Brakel & Bart Buelens & Sabine Krieg & Marc Smeets**51-73 Propensity to respond and nonresponse bias***by*J. Michael Brick & Michael E. Jones**75-90 A multiple imputation method for non-Gaussian data***by*Marco Di Zio & Ugo Guarnera**91-108 Evaluation of some approximate variance estimators under the Rao-Sampford unequal probability sampling design***by*David Haziza & Fulvia Mecatti & J.N.K. Rao**109-134 Data disclosure limitation as a decision problem***by*Mario Trottini

### 2007, Volume LXV, Issue 3

**259-275 Distribution of Shannon statistic from normal sample***by*Mamoun Abu Hammad & Adnan M. Awad**277-303 Statistics with fuzzy random variables***by*Ana Colubi & Renato Coppi & Pierpaolo D’urso & Maria angeles Gil**305-318 On probability limits for phase II S control chart***by*Lingyun Zhang & K. Govindaraju**319-336 Proportional mean residual life model for gap time distributions of recurrent events***by*V. N. Sreeja & P. G. Sankaran**337-361 Assessing the goodness of fit of a latent variable model for ordinal data***by*Silvia cagnone & Stefania Mignani**363-370 The geometry of inadmissibility of independent observations for estimating a single parameter in two-parameter ordered symmetric problems***by*Constantine E. Frangakis & Hao Wu**371-385 On a stress – strength model in Burr of type III***by*Ahmed Ibrahim Shawky & Fawziah Hassan Al-Kashkari

### 2007, Volume LXV, Issue 2

**133-151 A sequentially rejective procedure for exponential populations***by*Gulfam Siddiqui & Narinder Kumar & Gobind P. Mehta**153-174 A new bivariate beta distribution with application to drought data***by*Saralees Nadarajah**175-199 Robustification and performance evaluation of empirical risk measures and other vector-valued estimators***by*Vytaras Brazauskas & Bruce L. Jones & Ricardas Zitikis**201-227 A general class of estimators in successive sampling***by*Housila P. Singh & Gajendra K. Vishwakarma**229-238 Efficient neighbour balanced block designs for correlated observations***by*Jitendra Singh Tomar & Seema Jaggi**239-257 Reliability estimation based on general progressive censored data from theWeibull model: comparison between Bayesian and classical approaches***by*Ayman M. Abd-Elrahman & Khalaf S. Sultan

### 2007, Volume LXV, Issue 1

**1-2 Editorial***by*Pier Luigi Conti**3-21 Doing thousands of hypothesis tests at the same time***by*Bradley Efron**23-34 Optimum simple step-stress plan for log-logistic cumulative exposure model***by*Mohammed Al-Haj Ebrahem & Abedel-Qader Al-Masri**35-51 Markov chains on the reference set of contingency tables with upper bounds***by*Fabio Rapallo & Maria Piera Rogantin**53-57 A simple characterization of Student’s t2 distribution***by*Ludmila Nevzorova & Valery B.Nevzorov & Ilham Akhundov**59-66 A simple randomized response technique in complex surveys***by*Amitava Saha**67-97 Conflicting information and location parameter inference***by*Alain Desgagné & Jean-François Angers**99-112 Estimation of finite population mean using multi-auxiliary information***by*Giancarlo Diana & Pier Francesco Perri**113-127 On the Pitman estimator for a family of non-regular distributions***by*Masafumi Akahira & Nao Ohyauchi & Kei Takeuchi**129-131 Book reviews***by*Valentina Guizzi

### 2006, Volume LXIV, Issue 3

**273-274 Editorial***by*Giovanni Maria Giorgi**275-301 Causal effects in the presence of non compliance: a latent variable interpretation***by*Antonio Forcina**303-314 Decomposition for polynomial cumulative symmetry model in square contingency tables with ordered categories***by*Sadao Tomizawa & Nobuko Miyamoto & Kouji Yamamoto**315-326 D-optimal designs in two orthogonal blocks for Darroch and Waller's quadratic model in constrained mixture components***by*Manohar L. Aggarwal & Poonam Singh**327-341 A dependence measure for bivariate failure time data***by*Paduthol Gaduthol Sankaran & Bovas Abraham & Ansa Alphonsa Antony**343-355 Variance residual life function in reliability studies***by*Ramesh C. Gupta**357-375 Alternative Shewhart-type charts for grouped observations***by*Willem Albers & Wilbert C.M. Kallenberg**377-384 Explicit expressions for moments of beta order statistics***by*Saralees Nadarajah**385-397 Gini indices as areas and covariances: what is the difference between the two representations?***by*Edna Schechtman & Ricardas Zitikis**399-409 A new test of association and other tests based on the Gini mean difference***by*Magdalena Niewiadomska-Bugaj & Teresa Kowalczyk & Hend Ouda

### 2006, Volume LXIV, Issue 2

**131-144 A characterization of multivariate distributions by conditional moments***by*F. Lopez Blasquez & D. Pommeret**145-159 A generalization of Huang's randomized response procedure for the estimation of population proportion and sensitivity level***by*Marzia Marcheselli & Lucio Barabesi**161-177 Estimation of variance from missing data***by*Raghunath Arnab & Sarjinder Singh**179-198 Bayesian estimation procedures for a family of lifetime distributions under squared-error and entropy losses***by*Ajit Chaturvedi & Khumukcham Gopichandra Singh**199-215 Progressively censored data from the linear exponential distribution: moments and estimation***by*Mahmoud R. Mahmoud & Khalaf S. Sultan & Hassan M. Saleh**217-238 Distribution and percentage points of LRC for testing multisample compound symmetry in the bivariate and the trivariate cases***by*Daya K. Nagar & Maria Eugenia Castaneda**239-251 Reliability studies of bivariate distributions with Pearson type VII conditionals***by*Ramesh C. Gupta**253-271 The role of the exogenous randomness in the identification of conditional models***by*Abderrahim Oulhaj & Michel Mouchart

### 2006, Volume LXIV, Issue 1

**1-17 High-dimensional intergration for robustness***by*Chris Field & Stephan Morgenthaler & John W. Tukey**19-28 Equivalence of posteriors in the Bayesian analysis of the multinomial-Poisson transformation***by*Malay Ghosh & Li Zahng & Bhramar Mukherjee**29-45 On the asymptotic inference for response-adaptive experiments***by*Alessandro Baldi Antognini & Alessandra Giovagnoli**47-60 Nonparametric estimation of P(X***by*Ayman Baklizi & Omar Eidous**61-92 On the distribution of random Dirichlet jumps***by*Nils Lid Hjort & Andrea Ongaro**93-106 A parametric model for income and other size distributions and some extensions***by*William J. Reed**107-124 Asymptotic and bootstrap inference for the generalized Gini indices***by*Giovanni Maria Giorgi & Paola Palmitesta & Corrado Provasi

### 2005, Volume LXIII, Issue 3

**299-315 Gini's scientific work: an evergreen***by*Giovanni Maria Giorgi**317-327 Inequality measures for multivariate distributions***by*Barry C. Arnold**329-349 Gini diversity index, Hamming distance, and curse of dimensionality***by*Pranab K. Sen**351-372 An index of monotonicity and its estimation: a step beyond econometric applications of the Gini index***by*Youri Davydov & Ricardas Zitikis**373-400 The Gini coefficient reveals more***by*Peter J. Lambert & Andre' Decoster**401-433 The properties of the extended Gini measures of variability and inequality***by*Shlomo Yitzhaki & Edna Schechtman**435-450 Objective Bayesian intervals: some remarks on Gini's approach***by*Benito V. Frosini**451-469 The use of the Lorenz curve, Gini index and related measures of relative inequality and uniformity in securities law***by*Joseph Gastwirth & Reza Modarres & Efstathia Bura**471-492 Gini's mean difference and the measurement of absolute mobility***by*Jacques Silber & Michal Weber**493-503 Decomposition of rank-dependent measures of inequality by subgroups***by*Rolf Aaberge & Steinar Bjerve & Kjell Doksum**505-527 About a class of max-stable families with applications to income distributions***by*Jese Maria Sarabia & Enrique Castillo**529-559 Inverse stochastic orders and generalized Gini functionals***by*Fabio Maccheroni & Pietro Muliere & Claudio Zoli

### 2005, Volume LXIII, Issue 2

**143-176 Longitudinal and incomplete clinical studies***by*Geert Verbeke & Geert Molenberghs**177-191 Outliers in block designs for diallel crosses***by*Subhra Sarker & Rajender Parsad & Vinod Kumar Gupta**193-211 Testing for the order of risk measures: an application of L-statistics in actuarial science***by*Bruce L. Jones & Ricardas Zitikis**213-223 The exact sampling distribution of L-statistics***by*Corrado Crocetta & Nicola Loperfido**225-261 Survey of developments in the theory of continuous skewed distributions***by*Samuel Kotz & Donatella Vicari**263-296 A look at the structure of some extended Ginis***by*Walter Piesch

### 2005, Volume LXIII, Issue 1

**1-38 On the measurement of concentration and variability of characters***by*Corrado Gini**39-53 On certain countable mixtures of absolutely continuous distributions***by*Essam K. Al-Hussaini & Mohamed E. Ghitany**55-80 Asymptotic distribution and robustness of minimum total variation distance estimators***by*Federico Bassetti & Eugenio Regazzini**81-101 Identifiability Conditions for Spatio-Temporal Bayesian Dynamic Linear Models***by*Stefano F. Tonellato**103-114 Optimum stratification for scrambled response in pps sampling***by*Pawan Kumar Mahajan & Ravindra Singh**115-134 On a two-color generalized Polya urn***by*Caterina May & Anna Maria Paganoni & Piercesare Secchi

### 2004, Volume LXII, Issue 3

**287-313 The Gini Instrumental Variable, or the “double instrumental variable” estimator***by*Shlomo Yitzhaki & Edna Schechtman**315-326 Some results on the stress–strength model for skew-normal variates***by*Adelchi Azzalini & Monica Chiogna**327-337 Recurrence relations for single and product moments of generalized order statistics from a general class of distribution***by*Haseeb Athar & Hasan Mateen-Ul Islam**339-351 Partial moments for bivariate distributions***by*Paduthol Godan Sankaran & Narayanan Unnikrishnan Nair**353-362 Characterizations of some continuous distributions using partial moments***by*Sreenarayanapurath Madhavan Sunoj**363-375 Least-squares approximation of smooth functions of means***by*Andrea Pallini**377-389 Maximum likelihood estimation from record-breaking data for the generalized Pareto distribution***by*Nagi S. Abd-El-Hakim & Khalaf S. Sultan**391-411 A statistical model for the dynamics between two fuzzy states: theory and an application to poverty analysis***by*Gianni Betti & Bruno Cheli & Riccardo Cambini

### 2004, Volume LXII, Issue 2

**161-184 Robust tests of predictive accuracy***by*Rosario Dell'Aquila & Elvezio Ronchetti**185-200 Efficiency and local optimality of nonparametric tests based on U- and V-statistics***by*Yakov Y. Nikitin & Irina Peaucelle**201-222 Approximated inference for the quantile function via Dirichlet processes***by*Pier Luigi Conti**223-232 Estimation for finite population variance in double sampling***by*Giancarlo Diana & Chiara Tommasi**233-246 Order statistics with random sample size***by*Haroon M. Barakat & Mouhamed A. El-Shandidy**247-281 Welfare indicators: a review and new perspectives. 2. Measurement of poverty***by*Satya R. Chakravarty & Pietro Muliere

### 2004, Volume LXII, Issue 1

**1-14 Multivariate tests based on empirical saddlepoint approximations***by*John Robinson**15-37 On applications of marginal models for categorical data***by*Tamás Rudas & Wicher P. Bergsma**39-61 Estimating threshold subset autoregressive moving-average models by genetic algorithms***by*Roberto Baragona & Francesco Battaglia & Domenico Cucina**63-71 On the distribution of order statistics from generalized logistic samples***by*Arak M. Mathai & Serge B. Provost**73-84 Efficient imputation-based regression-type estimators in the presence of non-response***by*Mool Chandra Agrawal & Dulal Chandra Roy**85-99 Recurrence relations for moment generating functions of order statistics***by*Essam K. Al-Hussaini & Abd El-Baset A. Ahmad & Hanan H. El-Boghdady**101-114 Frame error modeling for a vehicle speed survey***by*Annica Isaksson**115-135 Bayesian analysis of generalized four-parameter Burr distribution via Gibbs sampler***by*Satyanshu Kumar Upadhyay & Iftikhar Ahmed Javed & Meena Peshwani**137-160 A new class of inequality measures based on a ratio of L-statistics***by*Agostino Tarsitano

### 2003, Volume LXI, Issue 3

**323-353 Copulas: concepts and novel applications***by*Kouros Owzar & Pranab Kumar Sen**355-374 A Monte Carlo integration approach to Horvitz-Thompson estimation in replicated environmental designs***by*Lucio Barabesi**375-388 A Permutation test for matching and its asymptotic distribution***by*Larry Goldstein & Yosef Rinott**389-401 Order statistics from inverse Weibull distribution and characterizations***by*Mohamed Abdel Wahab Mahmoud & Khalaf Salman Sultan & Safaa Mousa Amer**403-418 Point and interval estimations for the Gompertz distribution under progressive type-II censoring***by*Shuo-Jye Wu & Chun-Tao Chang & Tzong-Ru Tsai**419-430 Optimal orthogonal designs in two blocks for Darroch and Waller’s quadratic mixture model in three and four components***by*Poonam Singh**431-455 Finite and infinite mixtures for financial durations***by*Giovanni De Luca & Paola Zuccolotto**457-497 Welfare indicators: A review and new perspectives. 1. Measurement of inequality***by*Satya R. Chakravarty & Pietro Muliere

### 2003, Volume LXI, Issue 2

**151-190 Statistical tests on tail index of a probability distribution***by*Jana Jurecková**191-204 Reliability for Pareto models***by*Saralees Nadarajah & Samuel Kotz**205-219 A note on the estimation of the skew normal and the skew exponential power distributions***by*Anna Clara Monti**221-226 Identities in order statistics: from generalized Bernoulli to arbitrary***by*Krishnaswami Balasubramanian & Mirza Iftekhar Beg**227-242 Better bootstrapping by constrained prepivoting***by*G. Alastair Young**243-266 Unified conditional frequentist and Bayesian testing: computations in practice and sample size determination***by*Alessio Farcomeni**267-283 Partial sufficiency with connection to the identification problem***by*Abderrahim Oulhaj & Michel Mouchart**285-316 Gini’s Mean difference: a superior measure of variability for non-normal distributions***by*Shlomo Yitzhaki**317-321 Obituary Giovanni Battista Tranquilli (1935-2003)***by*Pier Luigi Conti

### 2003, Volume LXI, Issue 1

**3-4 Editorial***by*Giovanni Maria Giorgi**5-11 A correspondence between point-symmetric and classical log-linear models***by*Maria Kateri & Takis Papaioannou**13-26 Dual generalized order statistics***by*Marco Burkschat & Erhard Cramer & Udo Kamps**27-33 Recurrence relations for marginal and joint moment generating functions of generalized order statistics from power function distribution***by*Jagdish Saran & Aparna Pandey**35-52 Sample size allocation for stratified sampling under a correlated superpopulation model***by*Bhuwaneshwar K. Gupt**53-74 Jackknifing a general class of estimators and variance estimation under two-phase sampling***by*Debesh Roy & Md. Safiquzzaman**75-90 Ratio estimation using stratified ranked set sample***by*Hani M. Samawi & Mahmoud I. Siam**91-103 Efficiency properties of weighted mixed regression estimation***by*Helge Toutenburg & Viren K. Srivastava & Burkhard Schaffrin & Christian Heumann**105-117 Concentration probabilities and generalized mixed regression estimators in regression model***by*R. Karan Singh & S. Qaim Akbar & S. A. H. Rizvi**119-132 Bayesian inference for threshold moving average models***by*Mohamed A. Ismail & Husni A. Charif**133-150 Bayesian and conditional frequentist analyses of the Fieller’s problem. A critical review***by*Brunero Liseo

### 2002, Volume LX, Issue 3-4

**3-17 Resampling estimators of specie richness from presence-absence data: why they don't work***by*Luana D'Alessandro & Lorenzo Fattorini**18-28 First Borel-Cantelli equalities incorporating known dependency structure***by*Donald R. Hoover**29-48 On regression analysis using bivariate ranked set samples***by*Hani M. Samawi & Mohammad Fraiwan Al-Saleh**49-63 Modelling the impact of open volume on inter-trade autoregressive durations***by*Paola Zuccolotto**64-92 A robust technique for the estimation of the two-parameter Weibull function for complete data sets***by*M. Cacciari & G. Mazzanti & G. C. Montanari & J. Jacquelin**93-107 Characterizations of generalized mixtures of geometric and exponential distributions based on order statistics***by*Jong-Wuu Wu**108-124 A Bayesian decision theoretic interpretation of testing linear hypotheses***by*Valeria Ardito