Stefan Ralescu
Encyclopedia
Ştefan S. Ralescu is a leading statistician who has made significant contributions to the theory of statistical inference
, mainly through asymptotic theory
. He is a professor of mathematics and statistics at Queens College of the City University of New York
in New York
. He studied first at the University of Bucharest
obtaining an MA in mathematics (1976). He came to Indiana University
in 1977, completing his PhD in 1981 under the direction of Madan L. Puri. Before moving to New York, Ralescu was an Assistant Professor in the Division of Applied Mathematics at Brown University (1981–1984).
His research themes are varied, with noteworthy contributions in the fields of asymptotic theory of perturbed empirical and quantile processes, nonparametric density estimation
and Stein estimation (see James–Stein estimator). Other applied work that received praise was written up in collaboration with Dr. A. Cassvan in connection to techniques using brain auditory evoked potentials (BAEP). The paper "Brainstem auditory evoked potential studies in patients with tinnitus and/or vertigo" is a standard reference.
He has published more than 70 research articles in prestigious scientific international periodicals. He is an Associate Editor of Journal of Statistical Planning and Inference (JSPI) and International Journal of Statistics and Systems (IJSS). He was a former director of the mathematics section of the PSC-CUNY Research Foundation.
Ralescu is an Elected Fellow of the International Statistical Institute. His Erdős number
is 2. He is listed in Marquis Who's Who
in Science and Engineering (since 1995).
His hobbies include rare book collecting
and bridge. A bridge champion in his native Romania in the early 1970s, Ştefan Ralescu has published many bridge articles that have appeared in The Bridge World
, the ACBL Bulletin and Bridge Today, among other magazines.
Statistical inference
In statistics, statistical inference is the process of drawing conclusions from data that are subject to random variation, for example, observational errors or sampling variation...
, mainly through asymptotic theory
Asymptotic theory
Asymptotic theory or large sample theory is the branch of mathematics which studies properties of asymptotic expansions.The most known result of this field is the prime number theorem:...
. He is a professor of mathematics and statistics at Queens College of the City University of New York
City University of New York
The City University of New York is the public university system of New York City, with its administrative offices in Yorkville in Manhattan. It is the largest urban university in the United States, consisting of 23 institutions: 11 senior colleges, six community colleges, the William E...
in New York
New York
New York is a state in the Northeastern region of the United States. It is the nation's third most populous state. New York is bordered by New Jersey and Pennsylvania to the south, and by Connecticut, Massachusetts and Vermont to the east...
. He studied first at the University of Bucharest
University of Bucharest
The University of Bucharest , in Romania, is a university founded in 1864 by decree of Prince Alexander John Cuza to convert the former Saint Sava Academy into the current University of Bucharest.-Presentation:...
obtaining an MA in mathematics (1976). He came to Indiana University
Indiana University
Indiana University is a multi-campus public university system in the state of Indiana, United States. Indiana University has a combined student body of more than 100,000 students, including approximately 42,000 students enrolled at the Indiana University Bloomington campus and approximately 37,000...
in 1977, completing his PhD in 1981 under the direction of Madan L. Puri. Before moving to New York, Ralescu was an Assistant Professor in the Division of Applied Mathematics at Brown University (1981–1984).
His research themes are varied, with noteworthy contributions in the fields of asymptotic theory of perturbed empirical and quantile processes, nonparametric density estimation
Density estimation
In probability and statistics,density estimation is the construction of an estimate, based on observed data, of an unobservable underlying probability density function...
and Stein estimation (see James–Stein estimator). Other applied work that received praise was written up in collaboration with Dr. A. Cassvan in connection to techniques using brain auditory evoked potentials (BAEP). The paper "Brainstem auditory evoked potential studies in patients with tinnitus and/or vertigo" is a standard reference.
He has published more than 70 research articles in prestigious scientific international periodicals. He is an Associate Editor of Journal of Statistical Planning and Inference (JSPI) and International Journal of Statistics and Systems (IJSS). He was a former director of the mathematics section of the PSC-CUNY Research Foundation.
Ralescu is an Elected Fellow of the International Statistical Institute. His Erdős number
Erdos number
The Erdős number describes the "collaborative distance" between a person and mathematician Paul Erdős, as measured by authorship of mathematical papers.The same principle has been proposed for other eminent persons in other fields.- Overview :...
is 2. He is listed in Marquis Who's Who
Marquis Who's Who
Marquis Who's Who, a subsidiary of News Communications, Inc., is the American publisher of a number of directories containing short biographies...
in Science and Engineering (since 1995).
His hobbies include rare book collecting
Book collecting
Book collecting is the collecting of books, including seeking, locating, acquiring, organizing, cataloging, displaying, storing, and maintaining whatever books are of interest to a given individual collector. The love of books is bibliophilia, and someone who loves to read, admire, and collect...
and bridge. A bridge champion in his native Romania in the early 1970s, Ştefan Ralescu has published many bridge articles that have appeared in The Bridge World
The Bridge World
The Bridge World , the oldest continuously published magazine about contract bridge, was founded in 1929 by Ely Culbertson. It has since been regarded as the game's principal journal, publicizing technical advances in bidding and the play of the cards, discussions of ethical issues, bridge politics...
, the ACBL Bulletin and Bridge Today, among other magazines.
Selected publications
- D. Ralescu, S. Ralescu, http://links.jstor.org/sici?sici=0090-5364(198101)9%3A1%3C177%3AACONAE%3E2.0.CO%3B2-0 A Class of Nonlinear Admissible Estimators in the One-Parameter Exponential Family, The Annals of Statistics, Vol. 9, No. 1, (1981), pp. 177–183.
- M. Seoh, S. Ralescu, M. L. Puri, http://links.jstor.org/sici?sici=0091-1798(198502)13%3A1%3C115%3ACTLDFG%3E2.0.CO%3B2-A Cramer Type Large Deviations for Generalized Rank Statistics, The Annals of Probability, Vol. 13, No. 1, (1985), pp. 115–125.
- M. L. Puri, S. Ralescu, http://cat.inist.fr/aModele=afficheN&cpsidt=7863289 Central limit theorem for perturbed empirical distribution functions evaluated at a random point, J. Multivar. Anal., Vol. 19, No. 2, (1986), pp. 273–279.
- A. Cassvan, S. Ralescu , E. Shapiro , F.G. Moshkovski , J. Weiss, http://cat.inist.fr/?aModele=afficheN&cpsidt=6713810 Median and radial sensory latencies to digit I as compared with other screening tests in carpal tunnel syndrome, Am. J. Phy. Med. , Vol. 67, (1988), pp. 221–224.
- P. Deheuvels, M.L. Puri, S.S. Ralescu, http://portal.acm.org/citation.cfm?id=64344 Asymptotic expansions for sums of nonidentically distributed Bernoulli random variables, J. Multivar. Anal., Vol. 28, No. 2, (1989), pp. 282–303.
- A. Cassvan, S. Ralescu, F.G.Moshkovski, E. Shapiro, http://jul.1990.med-bib.com/2369295.htm Brainstem auditory evoked potential studies in patients with tinnitus and/or vertigo, Arch. Phys. Med. Rehabil., 71(8),(1990), pp. 583–586.
- S.S. Ralescu, http://cat.inist.fr/?aModele=afficheN&cpsidt=5522800 Asymptotic deviations between perturbed empirical and quantile processes, J. Stat. Plan. Inference, Vol. 32, No. 2, (1992), pp. 243–258.
- S. Ralescu, A.C. Brandwein, W.E. Strawderman, http://cat.inist.fr/?aModele=afficheN&cpsidt=4494011 Stein estimation for non-normal spherically symmetric location families in three dimensions, J. Multivar. Anal., Vol. 42, No. 1, (1992), pp. 35–50.
- S. Ralescu, A.C. Brandwein, W. E. Strawderman, http://www.springerlink.com/content/r222761742ql0w56/ Shrinkage Estimators of the Location Parameter for Certain Spherically Symmetric Distributions, Annals of the Institute of Statistical Mathematics, 45, (3), (1993), pp. 551–65.
- S. Ralescu, http://portal.acm.org/citation.cfm?id=201365.201375, The law of the iterated logarithm for the multivariate nearest neighbor density estimators, J. Multivar. Anal., Vol. 53, No. 1,(1995), pp. 159–179.
- S.S. Ralescu, http://direct.bl.uk/bld/PlaceOrder.do?UIN=030704782&ETOC=RN&from=searchengine A Bahadur–Kiefer law for the Nadaraya empiric-quantile processes, Theory Probab. Appl. Vol. 41, No. 2, (1996), 296–306 and Teor. Veroyatn. Primen. Vol. 41, No. 2, (1996), pp. 380–392.
- S.S. Ralescu, M.L. Puri, http://www.ingentaconnect.com/search/article;jsessionid=u6whcf483z7r.alice?title=Bahadur+representation&title_type=tka&year_from=1998&year_to=2007&database=1&pageSize=20&index=14 Weak convergence of sequences of first passage processes and applications, Stochastic Processes and their Applications, Vol. 62, No. 2, (1996), pp. 327–345.
- S. Ralescu, http://direct.bl.uk/bld/PlaceOrder.do?UIN=030704782&ETOC=RN&from=searchengine On solutions for global Stein optimization problems with applications, J. Stat. Plann. Inference 103, No.1–2, (2002), pp. 391–400.