Publications

Department of Mathematics




Publications

Refereed Publications

1. Muttlak , H, S. E. Ahmed and M. Al-Momani (2009). Shrinkage Estimation in Replicated Median Ranked Set Sampling. To appear in Journal of Statistical Computation and Simulation.
2. S. E. Ahmed, A. I. Volodin and I. N. Volodin (2009). High order approximation for the coverage probability by confident set cantered at the positive-part James-stein estimator. Statistics and Probability Letters, 79, 1823-1828.
3. S. Hossain, K. A. Doksum and S.E. Ahmed (2009). Positive Shrinkage, improved Pretest and absolute penalty estimators in partially linear Models. Linear Algebra and its Applications, 439, 2749-2761.
4. S. Nkurunziza and S. E. Ahmed (2009). Shrinkage drift parameter estimation for multi-factor Ornstein-Uhlenbeck processes. To appear in Applied Stochastic Models in Business and Industry.
5. S. E. Ahmed, K. Budsaba, S. Lisawadi and A. I. Volodin (2008). Parametric estimation for the Birnbaum-Saunders lifetime distribution based on a new parameterization. Thailand Statistician, 6, 213-240.
6. S.E. Ahmed and S. N. Liu (2009). Asymptotic simultaneous estimation of Poisson means. Linear Algebra and its Applications, 430, 2734-2748, .
7. D. Wang and S.E. Ahmed (2009). Point estimation for multi-spectral distributed random matrices. Linear Algebra and its Applications, 430, 2581-2591. <www.elsevier.com/locate/laa>
8. A. Bakilzi and S. E. Ahmed (2008). On the estimation of reliability function in a Weibull lifetime distribution. Statistics, 42, 351-362.
9. J. Pathak, A.A. Hussein and S. E. Ahmed (2008). What E-commerce audit Planners Should Remember: The top 10 Global CSFs for B2B Audit. Information System Control Journal, 1-4.
10. S. Buhamra, N. Al-Kandarri and S. E. Ahmed (2008). Inference on effect size indices from several two-armed experiments. Accepted for publication in Statistical Papers.
11. Snowdown, A. W., A.Hussein, and S.E. Ahmed (2008). Children at risk: Predictors of car safety seat misuse in Ontario. Accident Analysis and Prevention.
12. Snowdown, A. W., A.Hussein, L. High, L, Sttamler, J. Miller, L. Patrick and S.E. Ahmed (2008). The Effectiveness of a Multi-media Intervention for Parents on Knowledge of Safety Seat Use for Children. Journal of Pediatric Nursing, 23, 126-139.
13. S. E. Ahmed , K. A. Doksum , S. Hossain, and J. You (2007). Shrinkage, pretest and absolute penalty estimators in partially linear models. Australian & New Zealand Journal of Statistics, 49, 435-454.
14. S.E. Ahmed, A.A. Hussein and M. N. Goria (2007). Gamma mixture: bimodality, Inflexions and L-Moments. To appear in Communications in Statistics: Theory and Methods.
15. J. Pathak , S.Nkurunziza and S. E. Ahmed (2007). General theory of cost minimization strategies of continuous audit of data bases. Journal of Accounting and Public Policy, 26, 621–633.
16. Lihua, An and S. E. Ahmed (2007). Improving the performance of kurtosis estimator. Computational Statistics and Data Analysis, 52, 2669-2681.
17. S. Buhamra, N. Al-Kandarri and S. E. Ahmed (2007). Nonparametric inference strategies for the quantile functions under left truncation and right censoring. Journal of Nonparametric Statistics, 19, 189 - 198.
18. Al-Kandari, N. M., BuHamra, S. S., and S. E. Ahmed (2007). Merging information for effect size estimation. Journal of Applied Statistics, 34, 47-60.
19. S. E. Ahmed, E. Saleh, A. I. Volodin and I. N. Volodin (2007). Asymptotic expansion of the coverage probability of James-Stein Estimators. Journal of Theory of Probability and its Applications, 51, 683-695.
20. Kozak, M., Gozdowski, D., Hossain, S., Ahmed, S.E., Laudanski, Z., Wyszynski, Z. (2006). Canonical correlations in studying grain yield and protein content as affected by yield components: An ontogenetic approach. Plant Breeding and Seed Science, 54, 17-27.
21. S.E. Ahmed, A.A. Hussein and P. K. Sen (2006). Risk comparison of some shrinkage M-estimators in linear models. Journal of Nonparametric Statistics, 18, 401-415.
22. An, Lihua; Ahmed, S. E.; and Ali, Adnan (2006). Tumor Growth Rate Approximation-Assisted Estimation. Cancer Informatics, 2, 217-224.
23. Khan, B. U.; Ahmed, S. E., Comparisons of Improved Risk Estimators of the Multivariate Mean Vector, Computational Statistics & Data Analysis, 50, 402-421, 2006.
24. R. Ghori, S. E. Ahmed and A. A. Hussen (2006). Shrinkage Estimation of Gini index. A chapter in Contribution to Probability and Statistic: Application and Challenges, World Scientific publication.
25. S. E. Ahmed (2005). Assessing process capability index for nonnormal Processes. Journal of Statistical Planning and Inference, 129, 195-206.
26. S. E. Ahmed, A. I. Volodin, and A. A. Hussein (2005). Robust weighted likelihood estimation of exponential parameters. IEEE Transactions on Reliability, 54, 389-395.
27. S. E. Ahmed, D. Li, A. Rosalsky and A. I. Volodin (2005). On the asymptotic probability for the deviations of dependent bootstrap means from the sample mean. Lobachevskii Journal of Mathematics, 18, 3-20
28. N. Al-Kandarri, S. Buhamra and S. E. Ahmed (2005). Estimating and testing effect size from an arbitrary population. Journal of Statistical Computation and Simulation, 75, 987-1001.
29. S. E. Ahmed and C. J. Nicol (2005). Shrinkage estimation of the dose for a given mortality (2005). Journal of Applied Statistical Science, 14, 205-223.
30. S. Buhamra, N. Al-Kandarri and S. E. Ahmed (2004). Inference concerning quantile for left truncated and right censored data. Computational Statistics and Data Analysis, 46, 819-831.
31. S. E. Ahmed and W. J. Krzanowski (2004). Biased estimation in a simple multivariate regression model. Computational Statistics and Data Analysis. 45, 689-696.
32. S. E. Ahmed (2003). Pooling component means making sense or folly. New Developments in Psychometrics. Springer-Verlag:Tokyo.
33. B. U. Khan and S. E. Ahmed (2003). Improved Estimation of Coefficient Vector in a Regression Model. Communications in Statistics--Simulation and Computation, 32, 747-769.
34. S. E. Ahmed, R. G. Antonini and A.I. Volodin (2002). On the rate of complete convergence for weighted sums of arrays of Banach space valued random elements with application moving average processes. Statistics and Probability Letters, 58, 185-194.
35. S. E. Ahmed and S. M. Khan (2002). Using several data to structure efficient estimation of intraclass correlation coefficients. Measurement and Multivariate Analysis, Springer-Verlag:Tokyo.
36. S. E. Ahmed, A. I. Volodin and a. H. Joarder (2002). Pretest estimation of eigenvalues of a Wishart matrix. International Mathematical Journal, 1, 259-272. S. E. Ahmed and A. I. Volodin (2001). The complete convergence rates of rates of the bootstrap mean. Data Analysis From Statistical Foundations, 207-213. Editor: A. K. M. E. Saleh, Nova:New York.
37. S. E. Ahmed (2002). Simultaneous estimation of coefficients of variation. Journal of Statistical Planning and Inference, 104, 31-51. 23 pages.
38. S. E. Ahmed, D. Li,, A. Rosalsky and A. I. Volodin (2001). Almost sure lim sup behavior of bootstrapped means with applications to pairwise i.i.d. sequences and stationary ergodic sequences. in Journal of Statistical Planning and Inference. 98, 114.
39. S. E. Ahmed, A. K. Gupta, S. M. Khan and C. Nicol (2000). Simultaneous estimation of several intraclass correlation coefficients. To appear in Ann. Inst. Statist. Math., 53, 354-369.
40. S. E. Ahmed, T. C. Hu and A. I. Volodin (2001). On the rate of convergence of bootstrapped means in a Banach space. International Journal of Mathematics and Mathematical Sciences, 25, 629-635.
41. S. E. Ahmed, S .H. Sung and A. I. Volodin (2001). Mean convergence theorem for arrays of random elements in martingale type pBanach space. Bulletin of the Institute of Mathematics, Academia Sinica,30, 89-95.
42. S. E. Ahmed (2000). Point and interval estimation in the combination of bioassay results with unequal variances. Biometrical Journal, 42, 973-979.
43. S. E. Ahmed and M. Hanif (2000). On combining estimates of relative potency in bioassay with unequal variances. Pakistan Journal of Statistics, 16, 303-314.
44. S. E. Ahmed and M. H. Rahbar (2000). Shrinkage and pretest ponparametric estimation of regression parameters from pensored data with multiple observations at oach oevel of oovariate. Biometrical Journal, 42, 511-525.
45. . E. Ahmed and W. J. Braun (2000). testing the homogeneity of tumor growth rates in several models. stochastic Modelling and Applications, 3, 11-22.
46. S. E. Ahmed and R. J. Mcintosh (2000). An asymptotic approximation for the birthday problem. Curx Mathematicorum (A publication of Canadian Mathematical Society), 26, 151-155.
47. S. E. Ahmed and R. J. Kulperger (2000). Simultaneous estimation of the means of exponential distributions. F East J. Theo. Stat., 4, 297-318.
48. S. E. Ahmed (2000). Stein-type shrinkage quantile estimation. Stochastic Analysis And Applications, 18, 475-492.
49. M. Ahsanullhand S. E. Ahmed (2000). Bayes and empirical Bayes estimates of survival and hazard functions of a class of distributions. Empirical Bayes and Likelihood Inference, Lecture Notes in Statistics, 148, 81-87. Editors: S. E. Ahmed and N. Reid, Springer-Verlag: New York.
50. S. E. Ahmed (2000). Construction of improved estimators of multinomial proportions. Communications in Statistics: Theory and Methods, 29, 1273-1291.
51. S. E. Ahmed and A. K. Basu (2000). Least squares, preliminary test and Stein-type estimation in general vector AR(p) models. Statistica Neerlandica, 54, 47-66.
52. S. E. Ahmed (2000). Shrinkage estimation of regression coefficients from censored data with multiple observations. To appear in Empirical Bayes and Likelihood Inference, Lecture Notes in Statistics, 148, 103-120. Editors: S.E. Ahmed and N. Reid, Springer-Verlag: New York
53. S. E. Ahmed and M. Ahsanullah (1999). Testing and estimating signal to noise ratio. Applied Statistical Science, IV, 259-267.
54. S. E. Ahmed and E. Saleh (1999). Estimation of regression coefficients in an exponential regression model with censored observations. Japan Journal of Statistics, 29, 55-64.
55. S. E. Ahmed (1999). Simultaneous estimation of survivor functions in exponential lifetime models. Journal of Statistical Computation and Simulation, 63, 235-261.
56. Li, D., A. Rosalsky and S. E. Ahmed (1999). Complete convergence of bootstrapped mean and moments of the supremum of normed bootstrapped sums. Stochastic Analysis And Applications, 17, 799-814.
57. S. E. Ahmed and E. Saleh (1999). Improved nonparametric estimation of location vector in a multivariate regression Model, Nonparametric Statistics, 11,51-78.
58. S. E. Ahmed and B. Ullah (1999). To pool or not to pool: The multivariate data. Sankhya,61, Series B, 266-288.
59. S. E. Ahmed, S. Aslam and I. Mohamamd (1999). Inference concerning the hazard rate when life has an exponential distribution. Proc. Seventh Stat. Sem. K.U.
60. S. E. Ahmed and B. Ullah (1999). Improved biased estimation in an ANOVA model. Linear Algebra and its Applications, 289, 3-24.
61. A. H. Joarder and S. E. Ahmed (1998). Estimation of the scale matrix of a class of elliptical distributions. Metrika, 48, 149-160.
62. S. E. Ahmed (1998). Improved pretest nonparametric estimation in a multivariate regression model. Communications in Statistics: Theory and Methods, 27, 2391-2421.
63. S. E. Ahmed (1998). Large-Sample Estimation Strategies for Eigenvalues of a Wishart Matrix. Metrika, 47, 35-45.
64. S. E. Ahmed, D. S. Bhoj and M. Ahsanullah (1998). A Monte Carlo study of robustness of pretest and shrinkage estimators in pooling coefficients of variation. Biometrical Journal, 40, 737-751.
65. S. E. Ahmed (1998). Improved estimation of the parameters of an autoregressive Gaussian process under uncertain restriction. A chapter nonparametric Statistics and Related Topics, 97-111. Editors: S.E. Ahmed, M. Ahsanullah and B. K. Sinha, Nova Science: New York.
66. T. N. Mahdi, M. Zafaryab and S. E. Ahmed (1998). Improved Prediction in Parallelism Problem. Pakistan Journal of Statistics, 14, 1207-147.
67. T. N. Mahdi, S. E. Ahmed and M. Ahsanullah (1998). Improved prediction: Pooling two identical regression lines. Journal of Applied Statistics, 7, 63-86.
68. S. E. Ahmed (1997). Asymptotic shrinkage estimation: The regression case. A chapter in Applied Statistical Science II, 113-143. Editor: M. Ahsanullah, Nova Science: New York.
69. S. E. Ahmed (1997). To pool or not to pool the proportion in randomizes response survey. Communications in Statistics: Theory and Methods, 26, 2499-2525.
70. S. E. Ahmed (1997). Improved R-estimation of regression coefficients. Journal of Statistical Research, 31, 53-73.
71. S. E. Ahmed, M. Zafaryab and A. K. A. Katan (1997). Pooling slopes of several regression lines. Pakistan Journal of Statistics, 13, 79-86.
72. S. E. Ahmed and R.J. Tomkins (1997). On pooling means from two lognormal populations with unequal variances. Journal of Applied Statistical Sciences, 6, 1-19.
73. S. E. Ahmed and S. M. Khan (1997). Shrinkage estimation in randomized response model. InterStat, September issue, 1-20.
74. B. M. Kibria and S. E. Ahmed (1997). Shrinkage estimation for the multicollinear observations in a regression model with multivariate t disturbances. Journal of Statistical Research, 31, 83-102.
75. H. Joarder and S. E. Ahmed (1996). Estimation of the characteristic roots of the scale matrix. Metrika, 44, 259-267.
76. S. E. Ahmed and T. N. Mahdi (1996). Improved prediction in a simple regression model. Pakistan Journal of Statistics, 12, 201-213.
77. S.E. Ahmed and S. M. Khan (1996). On estimation of a set of binomial probabilities. Journal of Statistical Research, 30, 77-99.
78. S. E. Ahmed and V. J. Rohatgi (1996). Shrinkage estimation in a randomized response model. Metrika, 43, 17-30.
79. S. E. Ahmed (1995). A pooling methodology for coefficient of variation. Sankhya B, 57, 57-75.
80. S. E. Ahmed and J. S. Siddique (1995). Modifying median estimator with a preliminary test. Pakistan Journal of Statistics, 11, 117-122.
81. S. E. Ahmed (1995). Improved Shrinkage estimation of relative potency. Biometrical Journal, 37, 627-638.
82. S. E. Ahmed and R. J. Tomkins (1995). Estimating lognormal mean using uncertain prior information. Pakistan Journal of Statistics, 11, 67-92.
83. S. E. Ahmed, S. M. Khan and A. Khurshid (1995). Shrinkage estimation of the binomial proportion. Journal of Statistical Studies.
84. S. E. Ahmed (1994). Improved estimation in a multivariate regression model. Journal of Computational Statistics and Data Analysis, 17, 537-554.
85. S. E. Ahmed (1994). Improved estimation of the coefficient of variation. Journal of Applied Statistics, 21, 565-573.
86. S. E. Ahmed, S. M. Khan and M. A. Burney (1994). Estimating function of a parameter. Industrial Mathematics, 44, 15-21.
87. S. E. Ahmed (1993). Pooling reliability functions. Journal of Statistical Computation and Simulation, 49, 85-101.
88. S. E. Ahmed and E. Saleh (1993). Improved estimation for the component mean-vector. Japan Journal of Statistics, 43, 177-195.
89. S. E. Ahmed (1993). Pooling means under uncertain prior information with application to discrete distributions. Statistics, 24, 265-277.
90. S. E. Ahmed and S. M. Khan (1993). Improved estimation of the Poisson parameter. Statistica, anno LIII n.2, 268-286.
91. S. E. Ahmed (1992). Large sample pooling procedure for correlation. The Statistician, 41, 415-428.
92. S. E. Ahmed (1992). Shrinkage preliminary test estimation in multivariate normal distributions. Journal of Statistical Computation and Simulation, 43, 177-195.
93. R. J. Kulperger and S. E. Ahmed (1992). A bootstrap theorem for a preliminary test estimator. Communications in Statistics: Theory and Methods, 21, 2071-2082.
94. S. E. Ahmed and S. O. Badahdah (1992). On the estimation of the mean vector of a multivariate normal distribution under symmetry. Communications in Statistics: Theory and Methods, 21, 1759-1778.
95. S. E. Ahmed (1992). Asymptotic estimation of reliability in a life-testing model. Journal of Industrial Mathematics Society, 41, 7-18.
96. S. E. Ahmed and S. M. Khan (1991). Shrinkage estimation in pooling data for arbitrary populations. Environmetrics, 2, 457-474.
97. S. E. Ahmed (1991). To pool or not to pool: The Discrete Data. Statistics and Probability Letters, 11, 233-237.
98. S. E. Ahmed (1991). Combining Poisson means. Communications in Statistics: Theory and Methods, 20, 771-789.
99. S. E. Ahmed (1991). Use of apriori information in the estimation of Poisson Parameter. Soochow Journal of Mathematics, 16, 185-192.
100. S. E. Ahmed (1991). A note on the estimation of proportion in binomial population. Pakistan Journal of Statistics, 6, 63-70.
101. S. E. Ahmed and E. Saleh (1990). Estimation strategies for the intercept vector in a simple linear multivariate normal regression model. Journal of Computational Statistics and Data Analysis, 10, 193-206.
102. S. E. Ahmed and R. J. Kulperger (1990). Asymptotic con dence intervals from a preliminary test estimator. Environmetrics, 1, 295-303.
103. S. E. Ahmed and E. Saleh (1989). Pooling multivariate data. Journal of Statistical Computation and Simulation, 31, 149-167.
104. S. E. Ahmed (1989). Estimation theory under uncertain prior information. Pakistan Journal of Statistics, 5 , 211-228.
105. H.J. Malik, N. Balakrishnan and S. E. Ahmed (1988). Recurrence relations and identities of moments of order statistics I: Arbitrary continuous distributions. Communications in Statistics: Theory and Methods, 17, 2623-2655.
106. N. Balakrishnan, H. J. Malik and S. E. Ahmed (1988). Recurrence relations and identities of moments of order statistics II: speci c continuous distributions. Communications in Statistics: Theory and Methods, 17, 2657-2694.
107. S. E. Ahmed and E. Saleh (1988). Estimation strategy using a preliminary test in some univariate normal models. Soochow Journal of Mathematics, 14,135-65.
108. S. E. Ahmed and J. S. Siddique (1988). Linear regression diagnostics. Jour. Soc. Sci. & Humn., 2, 63-68.

 

Non-refereed contributions:

1. S. E. Ahmed (1999). Improved estimation of regression coefficient from censored data. Bulletin of the International Statistical Institute. 52nd Session, Book 11-12.
2. S. E. Ahmed and W. J. Braun (1996). Tumor growth rate pretest estimation. Proceedings of the Fifth Islamic Countries Conference on Statistical Sciences, Volume 1, Invited papers. Brawijaya University, Malang, Indonesia (INVITED PAPER).
3. S. E. Ahmed and S. M. Khan (1995). Improved estimation in a randomized response model. Proceedings of the Survey Methods Section, Statistics Canada, 103-106.
4. S. E. Ahmed and Bashirullah (1993). Combining data sources in estimation. Proceedings of the International Conference on Establishments Surveys of the American Statistical Association.
5. S. E. Ahmed (1989). Use of a priori information in the estimation of binomial proportion. Bulletin of the International Statistical Institute. 47th Session, 47-48.