SIMs Student Papers

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Now showing 1 - 13 of 13
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    A Bayesian hierarchical model for correlation in microarray studies
    Omolo, Bernard
    Microarrays are miniaturised biological devices consisting of molecules (e.g. DNA or protein), called \probes", that are orderly arranged at a microscopic scale onto a solid support such as a nylon membrane or a glass slide.The array elements (probes) bind speci cally to labeled molecules, called "targets", into complex molecular mixtures,thereby generating signals that reveal the identity and the concentration of the interacting labeled cells.Microarray analysis has a broad range of applications that involve di erent types of probes and/or targets (cDNA or oligos)
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    A Phase transition in the distribution of the length of integer partitions
    Ralaivaosaonay, Dimbinaina
    We assign a uniform probability to the set consisting of partitions of a positive integer n such that the multiplicity of each summand is less than a given number d and we study the limiting distribution of the number of summands in a random partition. It is known from a result by Erd˝os and Lehner published in 1941 that the distributions of the length in random restricted (d = 2) and random unrestricted (d n + 1) partitions behave very differently. In this paper we show that as the bound d increases we observe a phase transition in which the distribution goes from the Gaussian distribution of the restricted case to the Gumbel distribution of the unrestricted case.
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    Adverse information on social media will always send Kenyans to withdraw their money
    (2016-04) Karoney, Carol-Noelle; Kalu, Elizabeth
    In the paper “The Extent to Which Social Media Can Influence a Bank Run” Atieno,T. and Mutinda, M. (2014) provided empirical evidence that there was a huge risk of a bank run occurring in Kenya due to social media. This paper co-relates that study with the closure of Chase Bank Kenya in April 2016
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    Conditional CAPM in financial risk management: a quantile autoregression approach
    Kube, Ananda; Leo, Odongo; Mwita , Peter
    The study aims to provide a comprehensive description of dependence pattern of a stock by studying a range of betas derived as quantiles of conditional return distribution using quantile regression based on moving window regression.We investigate predictability of various parts of the conditional return distribution in a linear, autoregressive framework. We also aim to capture a state of dependence at di erent quantiles of the conditional return distribution. A good (bad) state is associated with upper (lower) quantiles,thus the impact of lagged returns is di erent across quantiles. Our empirical ndings are based on daily returns of major European stocks-sample data. Lower quantiles exhibit positive dependence with past returns while upper quantiles are marked by negative dependence. Central quantiles exhibit weak dependence. Keeping the sign of returns, we discover that positive previous day's return leads to strong positive returns with today's positive return and marked negative with today's negative return. The opposite pattern is visible for past negative returns.
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    Devolution and nation building
    Koki, Mulwa; Chege, Bernard N.; Nabulumbi, Lisa Wekhuyi
    One of the key reforms of the constitution is the establishment of devolution through the country’s government. It is in the current constitution and will only come into effect after the next general elections, when the county assemblies and governors will be elected. (Ghai, Y& Ghai, J,) In this paper we have talked about devolution and related it to the dignity of the human person. First we have given a definition for devolution as per the Kenyan context. Secondly, we will look at how the United Kingdom has being impacted since devolution was enforced. Thirdly, we looked at three aspects of devolution; objects and principles of a devolved government, financial aspect of devolution and the gender aspect of devolution. We came to the basis of these aspects by looking at how the common “mwananchi” will be affected by them. Lastly, we have given a summary of the responses we got from conducting an interview. We interviewed our fellow students and lecturer’s on their thoughts about devolution being implemented in Kenya. This includes the positive and negative effects of devolution and whether the country can afford this form of government.
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    Extending genstat capability to analyze rainfall data using Markov chain model
    Ster , David; Ong’ala, Jacob Otieno; Stern, Roger
    Rainfall is of critical importance for many people particularly those whose livelihoods are dependent on rain fed agriculture. Methods of analysis of daily rainfall records based on Markov chain models have been available for many years and their value is widely recognized. However they are rarely used because of the complexity of their analysis. This paper describes how these models are being made more accessible through a series of specially written procedures and menus in GenStat, a widely available statistics package.
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    Mathematical model for pneumonia dynamics among children
    Ong’ala, Jacob Otieno; Mugisha , Joseph; Odhiambo, John W.
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    Monads on a multiprojective space, Pa × Pb
    (International Mathematical Forum, ) Maingi, Damian
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    Surprising applications and possible extensions of Dellsarte's method
    Matolcsi, Mate; Ruzsa, I.; Weiner, M.
    This is a short informal survey on some surprising applications of Delsarte's method, written for anyone being interested. I try to keep it as short and as informative as possible
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    Water Filter Provision and Home-Based Filter Reinforcement Reduce Diarrhea in Kenyan HIV-Infected Adults and Their Household Members
    (The American Journal of Tropical Medicine and Hygiene, 2014) Chaba-Omondi, Linda Akoth
    Among human immunodeficiency virus (HIV) -infected adults and children in Africa, diarrheal disease remains a major cause of morbidity and mortality. We evaluated the effectiveness of provision and home-based reinforcement of a point-of-use water filtration device to reduce diarrhea among 361 HIV-infected adults in western Kenya by comparing prevalence of self-reported diarrhea before and after these interventions. After provision of the filter, 8.7% of participants reported diarrhea compared with 17.2% in the 3 months before filter provision (odds ratio [OR] = 0.39, 95% confidence interval [95% CI] = 0.23–0.66, P < 0.001). The association was similar among 231 participants who were already taking daily cotrimoxazole prophylaxis before being given a filter (OR = 0.47, 95% CI = 0.25–0.88, P = 0.019). Educational reinforcement was also associated with a modest reduction in self-reported diarrhea (OR = 0.50, 95% CI = 0.20–0.99, P = 0.047). Provision and reinforcement of water filters may confer significant benefit in reducing diarrhea among HIV-infected persons, even when cotrimoxazole prophylaxis is already being used.