Browsing School of Pure and Applied Sciences by Author "Otieno, Romanus Odhiambo"
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Adaptive nonparametric variance estimation for a ratio estimator
Otieno, Romanus Odhiambo (Jomo Kenyatta University of Agriculture and Technology (JKUAT), 1997) -
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 ... -
Bias Correction Technique for Estimating Quantiles of Finite Populations under Simple Random Sampling without Replacement
Makumi, Nicholas; Otieno, Romanus Odhiambo; Orwa, George O.; Were, Festus; Alexis, Habineza (Open Journal of Statistics, 2021-10)In this paper, the problem of nonparametric estimation of finite population quantile function using multiplicative bias correction technique is considered. A robust estimator of the finite population quantile function based ... -
Bias Reduction Technique for Estimating Finite Population Distribution Function under Simple Random Sampling without Replacement.
Onsongo, Winnie Mokeira; Otieno, Romanus Odhiambo; Orwa, George Otieno (International Journal of Statistics and Applications, 2018)The problem of nonparametric estimation of finite population distribution function using multiplicative bias correction technique is considered in this paper. A robust estimator of the finite population distribution function ... -
A bootstrap variance estimation under stratification with few units per stratum.
Habineza, Alexis; Otieno, Romanus Odhiambo; Orwa, George Otieno; Makumi, Nicholas (Journal of Statistics Applications & Probability Letters, 2022)The measurement errors exist and sample survey results are always uncertain because only a portion of the population is measured. Larger samples and superior measurement tools can help to reduce this uncertainty. The ... -
Classification of Stateless People through a Robust Nonparametric Kernel Discriminant Function
Obudho, Macdonald G.; Orwa, George O.; Otieno, Romanus Odhiambo; Were, Festus A. (Scientific Research Publishing, 2022-10-11)Statelessness is the absence of any Nationality. These include the Pemba, Shona, Galjeel, people of Burundi and Rwanda descent, and children born in Kenya to British Overseas Citizens after 1983. Frequently, they are not ... -
CLASSIFICATION RATES: NON-PARAMETRIC VERSES PARAMETRIC MODELS USING BINARY DATA
Adem, AO; Gichuhi, AW; Otieno, Romanus Odhiambo (Journal of Agriculture, Science and Technology, 2014)Estimations of the conditional mean and the marginal effects for particular small changes in the covariates have been of interest in financial, economics and even educational sectors. The standard approach has been to ... -
Comparing Edgeworth Expansion and Saddlepoint Approximation in Assessing the Asymptotic Normality Behavior of A Non-Parametric Estimator for Finite Population Total
Okungu, Jacob Oketch; Orwa, George Otieno; Otieno, Romanus Odhiambo (EJ-MATH, European Journal of Mathematics and Statistics, 2023-01)Abstract — Sample surveys concern themselves with drawing inferences about the population based on sample statistics. We assess the asymptotic normality behavior of a proposed nonparametric estimator for finite a population ... -
Comparison of some Panel Data Regression Model Estimators using Simulated Data
Otieno, Romanus Odhiambo; Megesa, JT; Chelule, JC (JKUAT, 2016)This paper presents estimation of panel data regression models with individual effects. We discuss estimation techniques for both fixed and random effects panel data regression models. We derive two-stage least squares and ... -
Comparison of the ratio estimate to the local linear polynomial estimate of finite population totals
Maua, Muga Zablon; Orwa, George Otieno; Otieno, Romanus Odhiambo; Odiwuor, Leo (International Journals of Multidisciplinary Research Academy, 2013)In this paper, attempt to study effects of extreme observations on two estimators of finite population total theoretically and by simulation is made. We compare the ratio estimate with the local linear polynomial estimate ... -
Coverage properties of a neural network estimator of finite population total in high-dimensional space.
Were, Festus A.; Orwa, George Otieno; Otieno, Romanus Odhiambo; Makumi, Nicholas; Aldallal, Ramy (Journal of Mathematics, 2022)The problem in nonparametric estimation of finite population total particularly when dealing with high-dimensional datasets is addressed in this paper. The coverage properties of a robust finite population total estimator ... -
Deriving Penalized Splines For Estimation Of Time Varying Effects In Survival Data
Orwa, Albert Otieno; Orwa, George Otieno; Otieno, Romanus Odhiambo (International Journal of Scientific & Technology Research, 2014)The major interests of survival analysis are either to compare the failure time distribution function or to assess the effects of covariate on survival via appropriate hazards regression models. Cox’s proportional hazards ... -
Deriving Some Estimators of Panel Data Regression Models with Individual Effects
Jirata, Megersa Tadesse; Chelule, J Cheruyot; Otieno, Romanus Odhiambo (International Journal of Science and Research, 2012) -
A Design Unbiased Variance Estimator of the Systematic Sample Means
Were, F; Orwa, George; Otieno, Romanus Odhiambo (American Journal of Theoretical and Applied Statistics, 2015) -
Effects of outliers on Estimation of Finite Population Totals
Maua, Muga Zablon; Orwa, George Otieno; Otieno, Romanus Odhiambo; Odiwuo, Leo (International Journals of Multidisciplinary Research Academy, 2013)In this paper, attempt to study effects of outliers on two estimators of finite population total theoretically and by simulation is made. We compare the ratio estimate with the local linear polynomial estimate of finite ... -
Estimating a Finite Population Total using a Density Function
Jakperik, Dioggban; Otieno, Romanus Odhiambo; Okungu, Jacob Oketch (Eurasian Bulletin of Mathematics, 2021-05-02)An improved method for finite population total estimation is proposed using a multiplicative semi-parametric bias reduction density function. The density is first applied to estimate a non-parametric regression model which ... -
Estimation of Non-smooth Functionals in Hilbert Sample Space Using the Edgeworth Expansions
Kololi, MM; Orwa, GO; Mung’atu, JK; Otieno, Romanus Odhiambo (Asian Journal of Probability and Statistics, 2019)An arbitrary non-smooth functional is estimated using a nonparametric set-up. Exploratory data analysis methods are relied on to come up with the functional form for the sample to allow both robustness and optimality to ... -
GENERALISED MODEL BASED CONFIDENCE INTERVALS IN TWO STAGE CLUSTER SAMPLING
Onyango, Christopher Ouma; Otieno, Romanus Odhiambo; Orwa, George Otieno (Pakistan Journal of Statistics and Operation Research, 2010)Chambers and Dorfman (2002) constructed bootstrap confidence intervals in model based estimation for finite population totals assuming that auxiliary values are available throughout a target population and that the auxiliary ... -
Inference on poverty indicators for Ghana
Jakperik, Dioggban; Otieno, Romanus Odhiambo; Orwa, George Otieno (2018-09-14)Poverty indicators are the fundamental statistics used to optimally determine the standards of living of people in any country. These are used for policy planing and analysis. Poverty indicators were estimated using ... -
Influence of formal structures on sustainable performance contracting of employees in chartered public universities in Kenya
Amwayi, Joshua Enane; Iravo, Mike Amuhaya; Otieno, Romanus Odhiambo; Lutsili, Victor Ladan (Journal of Human Resource and Leadership, 2018)Purpose: The study at investigating the influence of formal structures on sustainable performance contracting of employees in chartered public universities in Kenya Methods: The study adopted a descriptive research ...