Browsing School of Pure and Applied Sciences by Issue Date
Now showing items 1-20 of 170
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Adaptive nonparametric variance estimation for a ratio estimator
(Jomo Kenyatta University of Agriculture and Technology (JKUAT), 1997) -
Resilience of soils and vegetation subjected to different grazing intensities in a semi-arid rangeland of Kenya
(Taylor & Francis, 1997)The resilience of rangeland soils and vegetation to different levels of grazing is still poorly understood. A study was conducted to determine the recovery of a rangeland grazed at different intensities and allowed a ... -
Robust estimation of the error variance of the ratio estimator
(Egerton Journal of Humanities, Social Sciences and Education, 1999) -
Outlier Robustness of the Estimators of Variance of the Ratio Estimator
(Jomo Kenyatta University of Agriculture and Technology (JKUAT), 2002) -
Tree Layer Dynamics under Different Land Uses and Soils in Semi-Arid Areas of Kenya
(2002)A study was conducted to characterize the main factors critical to the distribution of key wood species and quantify the effects of land use on the tree layer in a semi-arid area of Kenya. Units studied were small-scale ... -
ROBUST ESTIMATION OF VARIANCE IN THE PRESENCE OF NEAREST NEIGHBOUR IMPUTATION
(African Journal of Science and Technology, 2003)The problem of estimating the variance of an estimator of the population total when missing values have been filled using a Nearest Neighbour (NN) imputation method is considered. The estimator is developed assuming a more ... -
Robust estimation of variance in the presence of nearest neighbour imputation
(African Network of Scientific and Technical Institutions (ANSTI), 2003)The problem of estimating the variance of an estimator of the population total when missing values have been filled using a Nearest Neighbour (NN) imputation method is considered. The estimator is developed assuming a more ... -
Seasonal time series forecasting: A comparative study of ARIMA and ANN models
(African Journal of Science and Technology (AJST), 2004)This paper addresses the concerns of Faraway and Chatfield (1998) who questioned the forecasting ability of Artificial Neural Networks (ANN). In particular the paper compares the performance of Artificial Neural Networks ... -
Seasonal time series data imputation: comparison between feed forward neural networks and parametric approaches
(JKUAT Press Ltd, 2005)Missing data in a time series may be an obstacle that may prevents further analysis of the available series either for control, explanations or forecasting. This paper addresses the problem of "‘filling in"' missing data ... -
Non-response weighting adjustment approach in survey sampling
(JKUAT Press Ltd, 2006)Non-response problem is an issue of great concern to all the researchers because it pervades almost all survey research. This ultimately creates potential for bias. The higher the non-response rate the greater the bias if ... -
Nonparametric model assisted model calibrated estimation in two stage survey sampling
(JKUAT Press Ltd, 2007) -
A new species of Melanochaeta from Kenya
(Verlag Ferdinand Berger & Söhne Ges.m.b.H., 2008)Melanochaeta taitensis is described as a new species from Kenya. It is distinguished from the other known species of Melanochaeta by having large, 3-septate, strongly curved ascospores. Phylogenetic analyses of nuclear 28S ... -
Two new genera in the Magnaporthaceae, a new addition to Ceratosphaeria and two new species of Lentomitella
(Taylor & Francis, 2008)Ceratosphaerella is described as a new genus for C. castillensis and C. rhizomorpha. The genus is related to Ophioceras but distinguished by ascomata with a basal stroma and shorter, fusiform ascospores. Muraeriata is ... -
Two new genera in Magnaporthaceae, a new addition to Ceratosphaeria, and two new species of Lentomitella
(2008)Ceratosphaerella is described as a new genus for C. castillensis and C. rhizomorpha. The genus is related to Ophioceras but distinguished by ascomata with a basal stroma and shorter, fusiform ascospores. Muraeriata is ... -
A molecular phylogenetic reappraisal of the Hysteriaceae, Mytilinidiaceae and Gloniaceae (Pleosporomycetidae, Dothideomycetes) with keys to world species.
(PubMed, 2009)A reappraisal of the phylogenetic integrity of bitunicate ascomycete fungi belonging to or previously affiliated with the Hysteriaceae, Mytilinidiaceae, Gloniaceae and Patellariaceae is presented, based on an analysis of ... -
Multigene phylogeny of the Coronophorales (ascomycota): morphology and new species in the order.
(PubMed, 2009)The phylogenetic relationships within Coronophorales have been debated because of uncertainty over the taxonomic usefulness of characterisitics such as quellkörper, number of ascospore appendages, presence of subiculum and ... -
Two new xylariaceous species from Kenya
(Mycotaxon, 2009)A survey of wood rotting ascomycetes in Kenya produced taxa in Biscogniauxia and Kretzschmaria that did not match descriptions of any known species and are hereby described as new species. The species of Biscogniauxia ... -
Parallel evolution of hysterothecial ascomata in ascolocularous fungi (Ascomycota, Fungi).
(The Natural History Museum, 2009-12-01)Ascoma morphologies have traditionally been used to classify filamentous ascomycete fungi. Phylogenies generated using DNA sequence data have since shown most of the previously identified groups not to be monophyletic. The ... -
GENERALISED MODEL BASED CONFIDENCE INTERVALS IN TWO STAGE CLUSTER SAMPLING
(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 ... -
Nonparametric mixed ratio estimator for a finite population total in stratified sampling
(Pakistan Journal of Statistics and Operation Research, 2010)We propose a nonparametric regression approach to the estimation of a finite population total in model based frameworks in the case of stratified sampling. Similar work has been done, by Nadaraya and Watson (1964), Hansen ...