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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Data and Information Science Society
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Korean Data and Information Science Society
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Volume 9, Issue 2 - Oct 1998
Volume 9, Issue 1 - Apr 1998
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Zero-Inflated Poisson Model with a Change-point
Kim, Kyung-Moo ;
Journal of the Korean Data and Information Science Society, volume 9, issue 1, 1998, Pages 1~9
In case of Zero-Inflated Poisson model with a change-point, likelihood ratio test statistic was used for testing hypothesis for a change-point. A change-point and several interesting parameters were estimated by using the method of moments and maximum likelihood. In order to compare the estimators, empirical mean-square-error was used. Real data for the Zero-Inflated Poisson model with a change-point and Poisson model without a change-point were examined.
Statistical Analysis of Agreement by Q-Q plot
Lee, Jae-Young ; Rhee, Seong-Won ; Lee, Jae-Woo ;
Journal of the Korean Data and Information Science Society, volume 9, issue 1, 1998, Pages 11~18
In clinical measurement comparison of a new measurement technique with an established one is often needed to see whether they agree sufficiently for the new to replace the old. Such investigations are often analysed inappropriately, notably by using the correlation coefficient(r). So, the measurement for agreement was determined by Bland & Altman's method recently. In this article, we will analyse the measurement for agreement by using Q-Q plot and by applying Bland and Altman's method through graph. And we will show characteristics for these techniques.
Asymptotic optimal bandwidth selection in kernel regression function estimation
Seong, Kyoung-Ha ; Kim, Dae-Hak ;
Journal of the Korean Data and Information Science Society, volume 9, issue 1, 1998, Pages 19~27
We considered the bandwidth selection method which has asymptotic optimal convergence rate
in kernel regression function estimation. For the proposed bandwidth selection, we considered Mean Averaged Squared Error as a performance criterion and its Taylor expansion to the fourth order. Then we estimate the bandwidth which minimizes the estimated approximate value of MASE. Finally we show the relative convergence rate between optimal bandwidth and proposed bandwidth.
A Linear Smoothing Spline Estimation and Applications
Yoon, Yong-Hwa ; Kim, Kyung-Mu ; Kim, Jong-Tae ;
Journal of the Korean Data and Information Science Society, volume 9, issue 1, 1998, Pages 29~36
A Simple, closed form expression is derived for a linear smoothing spline by Eubank (1994, 1997). We introduced his estimater and studied how well examples are fitted to this estimator with the values of minimum generalized cross validation.
The Confidence Bands for the Survival Function in Random Censorship Model
Lee, Won-Kee ; Song, Myung-Unn ; Song, Jae-Kee ; Park, Hee-Joo ;
Journal of the Korean Data and Information Science Society, volume 9, issue 1, 1998, Pages 37~45
We consider the problem of obtaining the confidence bands for the survival function with incomplete data. It is a rather simple procedure for constructing confidence bands of survival function. This method uses the weak convergence of normalized cumulative hazard estimator to a mean zero Gaussian process whose distribution can be easily approximated through simulation. Finally, we compare the performance of the proposed confidence bands through Monte Carlo simulation and we applied to construct the proposed bands with the Leukemia patient data.
Moments of the Bivariate Zero-Inflated Poisson Distributions
Kim, Kyung-Moo ; Lee, Sung-Ho ; Kim, Jong-Tae ;
Journal of the Korean Data and Information Science Society, volume 9, issue 1, 1998, Pages 47~56
Zero-Inflated Poisson models are mixed models of the Poisson and Bernoulli models. Recently Zero-Inflated Poisson distributions have been used frequently rather than previous Poisson distributions because the developement of industrial technology make few defects in manufacturing process. It is important that univariate Zero-Inflated Poisson distributions are extended to bivariate distributions to generalize the multivariate distributions. In this paper we proposed three types of the bivariate Zero-Inflated Poisson distributions and obtained these moments. We compared the three types of distributions by using the moments.
Determination of Sample Sizes for Plant Characteristics of Food Crops
Chang, Suk-Hwan ;
Journal of the Korean Data and Information Science Society, volume 9, issue 1, 1998, Pages 57~62
The minimum number of samples for the measurement of plant characteristics of major crops were calculated from the data obtained from the field experiments on rice, barley, wheat, soybean and sweet potato conducted by Kyungpuk Rural Development Administration.
A Study of Singular Value Decomposition in Data Reduction techniques
Shin, Yang-Kyu ;
Journal of the Korean Data and Information Science Society, volume 9, issue 1, 1998, Pages 63~70
The singular value decomposition is a tool which is used to find a linear structure of reduced dimension and to give interpretation of the lower dimensional structure about multivariate data. In this paper the singular value decomposition is reviewed from both algebraic and geometric point of view and, is illustrated the way which the tool is used in the multivariate techniques finding a simpler geometric structure for the data.
MRE for Exponential Distribution under General Progressive Type-II Censored Samples
Kang, Suk-Bok ; Cho, Young-Suk ;
Journal of the Korean Data and Information Science Society, volume 9, issue 1, 1998, Pages 71~76
By assuming a general progressive Type-II censored sample, we propose the minimum risk estimator (MRE) of the location parameter and the scale parameter of the two-parameter exponential distribution. An example is given to illustrate the methods of estimation discussed in this paper.
Boundary Corrected Smoothing Splines
Kim, Jong-Tae ;
Journal of the Korean Data and Information Science Society, volume 9, issue 1, 1998, Pages 77~88
Smoothing spline estimators are modified to remove boundary bias effects using the technique proposed in Eubank and Speckman (1991). An O(n) algorithm is developed for the computation of the resulting estimator as well as associated generalized cross-validation criteria, etc. The asymptotic properties of the estimator are studied for the case of a linear smoothing spline and the upper bound for the average mean squared error of the estimator given in Eubank and Speckman (1991) is shown to be asymptotically sharp in this case.
Bayesian Reliability Estimation of Two-Unit Rot Standby System
Lee, Chang-Soo ; Kim, Hee-Jae ; Moon, Yeung-Gil ; Lee, Jang-Choon ;
Journal of the Korean Data and Information Science Society, volume 9, issue 1, 1998, Pages 89~94
We shall propose several Bayes estimators for reliability of a two-unit hot standby system with the imperfect switch based upon a complete sample of failure times observed from an exponential distribution, and the proposed reliability Bayesian estimators are compared numerically each other in sense of mean squared error.