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RP-Department of Mathematics, Actuarial and Physical Sciences: Recent submissions

Now showing items 61-80 of 95

A novel flavonoid and furoquinoline alkaloids from vepris glomerata and their antioxidant activity

Kiplimo, Joyce; Koorbanally, Neil; Islam, Shahidul (Natural product communications, 2011-04-26)
Assessment of lead accumulation on soils and vegetables grown along major roads within Nakuru town

Kiplimo, Joyce; Mule, Shadrack; Mogusu, Sylvia (Journal of African research and development, 2016-07-10)

Lead has been found to be toxic to human beings even at low concentrations due to its negative effects on IQ, impaired hearing, behavioral problems (aggression) and delayed bone growth alongside causing death in some cases. ...
Adsorption of toxic crystal violet dye using coffee husks: Equilibrium, kinetics and thermodynamics study

Cheruiyot, Gilbert K; Wanyonyi, Wycliffe C; Kiplimo, Joyce J; Maina, Esther N (Scientific African, 2019)

Crystal violet (CV) dye is a water-soluble, toxic, recalcitrant organic dye that causes se- vere health problems and environment pollution. The current study assesses the potential of Waste Coffee Husks (WCH) in adsorption ...
Utilization of macadamia seed husks as a low-cost sorbent for removing cationic dye (basic blue 3 dye) from aqueous solution

Mutunga, Felista M; Wanyonyi, Wycliffe C; Ongera, Gilbert (Environmental chemistry and ecotoxicology, 2020)

This study examined the possibility of using Macadamia Seed Husks (MSH) as a low-cost sorbent for removal of recal- citrant Basic Blue 3 Dye (BB3). Batch adsorption experiments were performed to evaluate the capability ...
The effect of introduction of routine immunization for rotavirus vaccine on peadiatric admissions with diarroea and dehydration to Kenyan hospitals: an interrupted time series study with diarrhoea

Unknown author (wellcome open research, 2021-12-23)

Background: Dehydration secondary to diarrhoea is a major cause of hospitalization and mortality in children aged less than five years. Most diarrhoea cases in childhood are caused by rotavirus, and routine introduction ...
A review of natural plants as sources of substances for cleaner leather tanning technologies

Nalyanya, Kallen M; Rop, Ronald K; Onyuka, Arthur S; Birech, Zephania (Textile & leather review, 2021-09-07)

The stringent environmental regulations and compliance regarding leather tanning has compelled leather industry to seek alternative cleaner ingredients that have the capacity to minimize or prevent pollution caused by ...
Local linear regression estimator on the boundary correction in nonparametric regression estimation

Langat, Reuben C (Atlantis press, 2020-10-13)

The precision and accuracy of any estimation can inform one whether to use or not to use the estimated values. It is the crux of the matter to many if not all statisticians. For this to be realized biases of the estimates ...
On the bandwidth selection

Langat, Reuben C (ECRTD-UK, 2020-09)

One of the key parameters in density and regression estimation is the bandwidth. This has variously been termed as kernel width or window by various authors. It is a smoothing parameter that determines the amount of data ...
The Causal Relationship between Type 2 Diabetes Mellitus and Ovarian Cancer: Two-Sample Mendelian randomization

Langat, Kipkirui V; Lang’at, Reuben C; Okango, Ayubu A (Researchgate, 2021-06-29)

Aims: This research aimed at determining the causal relationship between type 2 diabetes mellitus (T2DM) and ovarian cancer using two-sample Mendelian randomization technique. This is because there is an assumption that ...
Modeling the effects of relationship between gender and condom usage on comprehensive HIV knowledge among the youths in Kenya

Terer, Kenneth K; Langat, Reuben (Science publishing group, 2021-04-30)

Globally, the spread of HIV/AIDS epidemic has turned out to be a major health challenge due to its vast undesirable effects. In 2018, Kenya joint the third largest HIV epidemic in the world alongside Mozambique and Uganda ...
Which approach to modeling? Predicting infectious disease dynamics in epidemics

Langat, Reuben C (Academic journal, 2020-11-11)

Disease outbreaks can be devastating to many nations. Interventions of all kinds are run alongside treatments or preventive measures. The effectiveness of the measures taken depends on the number of individuals who are ...
Exploring data-reflection technique in nonparametric regression estimation of finite population total: an empirical study

Langat, Reuben C (Science publishing group, 2020-06-03)

: In survey sampling statisticians often make estimation of population parameters. This can be done using a number of the available approaches which include design-based, model-based, model-assisted or randomization-assisted ...
Kernel function and nonparametric regression estimation: which function is appropriate?

Langat, Reuben C; Orwa, George O; Odhiambo, Romanus O (abjournals, 2020)

In regression estimation, researchers have the option of using parametric or nonparametric regression estimation. Because of the challenges that one can encounter as a result of model misspecification in the parametric ...
Logistic regression on effects of relationship between condom use on comprehensive HIV knowledge among the youths in Kenya

Terer, Kenneth K; Langat, Reuben; Otieno, Joyce (Science publishing group, 2019-08-13)

HIV/AIDS knowledge in Kenya is universal in that 99% of both male and female have heard of the epidemic and how it can be avoided. Despite the widespread knowledge of HIV/AIDS, comprehensive HIV knowledge which refers to ...
A boundary corrected non-parametric regression estimator for finite population total

Langat, Reuben C; Odhiambo, Romanus O; Orwa, George O (Canadian Center of Science and Education, 2019-04-27)

This study explores the estimation of finite population total. For many years design-based approach dominated the scene in statistical inference in sample surveys. The scenario has since changed with emergence of the other ...
An almost unbiased estimator in group testing with errors in inspection

Langat, Erick K; Tonui, Benard C; Langat, Reuben C (American journal of theoretical and applied statistics, 2016-05-25)

The idea of pooling samples into pools as a cost effective method of screening individuals for the presence of a disease in a large population is discussed. Group testing was designed to reduce diagnostic cost. Testing ...
On markovian queuing models

Tonui, Benard C; Langat, Reuben C; Gichengo, Joel M (International journal of science and research, 2012)

The ultimate objective of the analysis of queuing systems is to understand the behaviour of their underlying process so that informed and intelligent decisions can be made by the management. The application of queuing ...
Intersection matrices associated with non trivial suborbit corresponding to the action of rank 3 groups on the set of unordered pairs

Chepkorir, Betty; Rotich, John K; Tonui, Benard C; Langat, Reuben C (Research gate, 2014-12-12)

In this paper we find intersection numbers and intersection matrices associated with each non trivial sub orbit corresponding to the action of rank 3 groups; The symmetric group S5,alternating group A5 and The dihedral ...
Estimation of population total using model-based approach: a case of HIV/AIDS in Nakuru central district, Kenya

Langat, Reuben C; Tonui, Benard C; Lagat, Janet J (International journal of scientific & technology research, 2014-11-11)

: In this study we have explored an estimator for finite population total under the famous prediction approach. This approach has been compared with design-based approach using simple random sampling and stratified random ...
An investigation of student’s attitude towards use of chatbot technology in Instruction: the case of Knowie in a selected high school

Bii, Patrick; Too, Jackson; Langat, Reuben (Education research, 2013-10)

A chatbot named Knowie was implemented on a platform based on the open source software Ubuntu, Python, JDK, and PyAIML. A class of students was then given an opportunity to ask questions of and chat with the bot on a ...

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