Browsing School of Pure and Applied Sciences by Author "Orwa, George O"

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    • Bayesian Estimation of Survivor Function for Censored Data Using Lognormal Mixture Distributions 

      Nyambega, Henry Ondicho; Orwa, George O; Mung'atu, Joseph K; Otieno, Romanus Odhiambo (IOSR Journal of Mathematics, 2017)
      We use Bayesian methods to fit a lognormal mixture model with two components to right censored survival data to estimate the survivor function. This is done using a simulation-based Bayesian framework employing a prior ...

    • Longitudinal Survey, Nonmonotone, Nonresponse, Imputation, Nonparametric Regression 

      Pyeye, Sarah; Syengo, Charles K; Odongo, Leo; Orwa, George O; Otieno, Romanus Odhiambo (Scientific Research Publishing, 2016)
      The study focuses on the imputation for the longitudinal survey data which often has nonignorable nonrespondents. Local linear regression is used to impute the missing values and then the estimation of the time-dependent ...

    • Multivariate ratio estimator of the population total under stratified random sampling 

      Ngesa, Oscar O; Orwa, George O; Otieno, Romanus Odhiambo; Murray, Henry M (Scientific Research Publishing, 2012)
      Olkin [1] proposed a ratio estimator considering p auxiliary variables under simple random sampling. As is expected, Simple Random Sampling comes with relatively low levels of precision especially with regard to the fact ...

    • Robust Classification through a Nonparametric Kernel Discriminant Analysis 

      Obudho, Macdonald G; Orwa, George O; Otieno, Romanus Odhiambo; Were, Festus A (Scientific Research Publishing, 2022-08-10)
      The problem of classification in situations where the assumption of normality in the data is violated, and there are non-linear clustered structures in the dataset is addressed. A robust nonparametric kernel discriminant ...