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  • Identification of Failure Rate Behaviour of Increasing Convex (Concave) Transformations 
    Deepthi KS; Chacko VM (Gnedenko Forum, 2021-03)
    In this paper, increasing convex (concave)Total Time on Test (TTT) transform of a lifetime random variable is considered.In order to identify the failure rate model of functions of random variables, the TTT of transformed ...
  • Joint importance measures for multistate reliability systems 
    Chacko, VM; Manoharan, M (Operational Research Society of India, 2011-07-30)
    Importance and joint importance measures in reliability engineering are used to identify the weak areas of a system and signify the roles of components in either causing or contributing to proper functioning of the system. ...
  • Multidimensional outlier detection and robust estimation using Sn covariance 
    Kunjunni, Sajana O; Abraham, Sajesh T (Taylor & Francis Online, 2020-02-17)
    This article presents a robust method for detecting multiple outliers from multidimensional data using robust Mahalanobis distance. Initial scatter matrix for robust Mahalanobis distance is constructed using a robust ...
  • On Exponential-Weibull Distribution Useful in Reliability and Survival Analysis 
    Anakha KK; Chacko VM (Gnedenko Forum, 2020-03)
    In this paper, mixture of Exponential and Weibull distributions is considered for modelling real lifetime data. The basic mathematical properties including moments, generating functions, order statistics etc are derived. ...
  • A ‘One Parameter’ Bathtub Shaped Failure Rate Distribution 
    Chacko, VM; Thomas, Beenu; Deepthi, KS (Gnedenko Forum, 2017-09)
    Most real life system exhibit bathtub shapes for their failure rate functions. Generalized Lindley, Generalized Gamma, Exponentiated Weibull and xExponential distributions are proposed for modeling lifetime data having ...
  • A qualitative investigation of e-tail brand affect 
    Sarkar, Abhigyan; Sarkar, Juhi Gahlot; S, Sreejesh; Anusree, MR (Emerald Group Holdings Ltd, 2018-02-27)
    Purpose The purpose of this paper is to qualitatively investigate various factors associated with e-tail store brand affect. Design/methodology/approach Data were collected by conducting semi-structured depth interviews ...
  • A Queue Network M/M/1/∞ Model 
    Rajitha C; Chacko VM (Gnedenko Forum, 2019)
    In this paper we model an open queueing network of cardiac treatment section in medical sector. Assume arrival of patients follows Poisson and service times at stations have exponential distribution. The performance measures ...
  • Robust quadratic discriminant analysis using Sn covariance 
    Sajana, OK; Sajesh, TA (Taylor & Francis, 2021-03-15)
    This paper presents a robust method for robust estimation of quadratic discriminant analysis. The mean and covariance matrix for estimating quadratic discriminant rule is computed using a robust estimation method called ...
  • Sn covariance 
    Kunjunni, Sajana O; Abraham, Sajesh T (Taylor & Francis Online, 2019-06-16)
    Main purpose of this paper is to study a robust measure of estimating dependence between random variables that can be used as an alternative to classical covariance estimator. An efficient univariate nested L-estimator ...
  • Weibull-Lindley Distribution: A Bathtub Shaped Failure Rate Model 
    Chacko VM; Deepthi KS; Beenu Thomas; Rajitha C (Gnedenko Forum, 2018-12)
    The Lindley and Weibull are the two most commonly used distributions for analyzing lifetime data. These distributions have several desirable properties and nice physical interpretations. This paper introduces a new ...
  • You are so embarrassing, still, I hate you less! Investigating consumers’ brand embarrassment and brand hate 
    Sarkar, Abhigyan; Sarkar, Juhi Gahlot; Sreejesh, S; Anusree, MR; Rishi, Bikramjit (Springer, 2019-08-01)
    Brand hate is an emerging concept representing the dark side of the consumer–brand relationship. This research investigates whether negative brand social self-expressiveness can significantly predict brand hate via creating ...

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