S. N. Roy

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S.N. Roy
Samarendra Nath Roy
Born	December 11, 1906 Dhaka, Bangladesh, (erstwhile East Bengal)
Died	July 23, 1964 Jasper, Alberta, Canada
Residence	India , U.S.
Nationality	Indian- American
Fields	Mathematician
Institutions	Indian Statistical Institute University of North Carolina, Chapel Hill
Alma mater	Calcutta University University of North Carolina, Chapel Hill
Doctoral advisor	Prasanta Chandra Mahalanobis
Known for	multivariate analysis

Samarendra Nath Roy or S. N. Roy (Bangla: সমরেন্দ্র নাথ রায়) (born 1906 in Dhaka, East Bengal – 1964) was a Bengali Indian scientist, mathematician and an applied statistician. He was the first of two children of Kali Nath Roy and Suniti Bala Roy ^[1]. His father, Kali Nath Roy was a freedom fighter and the Chief Editor of the newspaper TRIBUNE ^[2].

Prof. Roy had a brilliant academic career. He secured first division in the Matriculation Examination in 1923. He came first in the Intermediate Science (Higher Secondary) Examinations in 1925. He also became first class first in both the B.Sc. Mathematics (Honours) from Presidency College, Kolkata, University of Calcutta in 1928 and the M.Sc. examinations from the University of Calcutta in 1931 ^[1].

At that time Professor P. C. Mahalanobis was the director of the new (1931) Indian Statistical Institute. Several talented young scholars including J. M. Sengupta, H. C. Sinha, Raj Chandra Bose, S. N. Roy, K. R. Nair, K. Kishen and C. R. Rao, joined to form an active group of statisticians under Prof. Mahalanobis. S. N. Roy was one of the very early students of Prof. Prasanta Chandra Mahalanobis, who initiated some of the early works in Statistics ^[3]. He was well known for his pioneering contribution to multivariate statistical analysis, mainly that of the Jacobians of complicated transformations for various exact distributions, rectangular coordinates and the Bartlett decomposition ^[4]. His dissertation included the Post master's work at the Indian Statistical Institute where he worked under Mahalanobis.

It was Bose who first went to the United States as a visiting professor at Columbia University and the University of North Carolina, Chapel Hill in 1947. Roy later joined him at the University of North Carolina Chapel Hill and later became Professor of Statistics. S. N. Roy had 15 doctorate students there from 1950 till 1963 ^[5]. To commemorate his Birth Centenary an International Conference on "Multivariate Statistical Methods in the 21st Century: The Legacy of Prof. S.N. Roy" was held at Kolkata, India during December 28-29, 2006 ^[6] . The Journal of Statistical Planning and Inference published a special Issue for celebrating of the Centennial of Birth of S. N. Roy ^[7].

Some Ph.D. works under S. N. Roy

• OLKIN, INGRAM (1951). "On distribution problems in multivariate analysis".
• PACHARES, JAMES (1953). "On the distribution of quadratic forms".
• PILLAI, K.C. SREEDHARAN (1954). "On some distribution problems in multivariate analysis".
• MITRA, SUJIT K. (1956)^[8]. "Contributions to the statistical analysis of categorical data".
• GNANADESIKAN, RAMANATHAN (1957). "Contributions to multivariate analysis including univariate and multivariate variance components analysis and factor analysis".
• POTTHOFF, RICHARD F. (1958). "Multi-dimensional incomplete block designs".
• DIAMOND, EARL L. (1958). "Asymptotic power and independence of certain classes of tests on categorical data".
• BARGMAN, ROLF (1958). "A study of independence and dependence in multivariate normal analysis".
• COBB, WHITFIELD (1959). "Studies in univariate and multivariate variance components analysis connected with sampling from a finite population".
• BHAPKAR, VASANT P. (1959). "Contributions to the statistical analysis of experiments with one or more responses".
• SATHE, YASHAWANDE S. (1962). "Studies in certain types of nonparametric inference".
• DAS GUPTA, SOMESH (1963). "Some problems in classification".

^[9].

Relevant Publications

• Roy, S. N. (1957), “Some Aspects of Multivariate Analysis”, New York: Wiley.
• Roy, S. N. and Sarhan, A. E. (1956), “On inverting a class of patterned matrices”, Biometrika, 43, 227-231.
• Potthoff and Roy, Biometrika, 313-316, 1964

References

1. ^ ^{a b} [1]
2. ^ "TRIBUNE"
3. ^ "Professor S.N. ROY: As I remember him"
4. ^ http://www.maths.leeds.ac.uk/statistics/research/reports/2007/STAT07-07.pdf
5. ^ " PhDs under Roy"
6. ^ http://www.isical.ac.in/~multstatconf/
7. ^ "Life and legacy of Samarendra Nath Roy 1906–1964, Govind S. Mudholkar, Alan D. Hutson and Michael P. McDermott, Journal of Statistical Planning and Inference, Volume 137, Issue 11, 2007, Pages 3208-3212"
8. ^ http://www.iisc.ernet.in/currsci/aug102004/395.pdf
9. ^ PhDs

External links

• ISI
• International Conference on Multivariate Statistical Methods in the 21st Century: The Legacy of Prof. S.N. Roy
• On S.N. Roy’s Legacy to Multivariate Analysis
• Samarendra Nath Roy: An Appreciation