TESTIMATION OF AVERAGE LIFE IN PRESENCE OF SUSPECTED OUTLIERS IN EXPONENTIAL LIFE MODEL UNDER ASYMMETRIC LOSS FUNCTION
Keywords:
Exponential model, scale parameter, outliers, asymmetric loss function, risk, life Ratio, risk ratioAbstract
The present paper proposes a preliminary test estimator of average life (scale parameter) in two parameter exponential distribution in presence of suspected outliers. The risk properties of this testimator have been studied under asymmetric loss function and it is claimed that the proposed testimator dominates the never pool estimator (in terms of having smaller risk) in the whole range of life ratio considered here.
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References
Bancroft, T. A. and Han, C. P. (1977). Inference based on conditional
specification: A note and a bibliography, Int. Stat. Rev., 45, p.117-127.
Basu, A. P. and Ebrahimi, N. (1991). Bayesian approach to life testing and
reliability estimation using asymmetric loss function, JSPI, 29, p. 21-31.
Canfield, R.V. (1970). A Bayesian approach to reliability estimation using a
loss function, IEEE transformations on Reliab., 19, p. 13-16.
Daniel, C. (1960). Locating outliers in factorial experiments, Technometrics, 2,
p. 149-156.
Dempster, A. P. and Rosner, B. (1971). Detection of outliers, Statistical
decision theory and related topics, p. 161-180 (Ed. S. S. Gupta), Academic
Press.
Grubbs, F. E. (1950). Sample criteria for testing outlying observations,
Ann. Math. Statist., 21, p. 27-58.
Grubbs, F. E. (1969). Procedures for detecting outlying observations in
samples, Technometrics, 11, p. 1-21.
Gupta, V. P. and Singh, Umesh (1985). Preliminary test estimator for
life data, Microelect Reliab., 25(5), p. 881-887.
Han, C. P., Rao, C. V. and Ravichandran, J. (1988). Inference based on
conditional specification: A second bibliography, Comm. Stat. -TM, 17(6), p.
-1966.
Kale, B. K. (1974 b). Detection of outlier, (Tech. Report 63, Deptt.
of Statistics, University of Manitoba) paper presented at the international
symposium on recent trends of research in statistics, held at I. S. I.,
Calcutta, December, 1974, appeared in Sankhya a , 38(B), p. 356-363.
Kale, B. K. (1979). Outliers - A Review, Jr. Ind. Statist. Assoc., 17, p. 51-67.
Pandey, B. N. and Rai, O. (1992). Bayesian estimation of mean and square of
mean of normal distribution using LINEX loss function, Comm. in Stat.
Theory and Method, 21 (2), p. 3386-3391.
Rai, O. (1996). A some times pool estimator of mean life under LINEX loss
function, Comm. in Stat. Theory and Method, 25, p. 2057-2067.
Srivastava, R. (1996). Bayesian estimation of scale parameter and reliability in
weibull distribution using asymmetric loss function, IAPQR transactions, 21
(2), p. 143-148 .
Srivastava,R. And Dulawat, M. S. (2002). Preliminary test estimator for
average life of Exponential distribution in presence of suspected outliers,
IAPQR transactions, Vol.27, No.1.
Tietjen, G. L. and Moore, R. H. (1972). Some Grubbs-type statistics for the
detection of several outliers, Technometrics, 14, p. 583-597.