438 research outputs found
Data in support of high rate of pregnancy related deaths in Maiduguri,Borno State,Northeast Nigeria
Pregnancy relateddeaths(PRD)arepublichealthconcerninmost
developing countriesandNigeriainparticular.Despitetheefforts
put inbytheconcernedauthorities,PRDremainsanintegralpart
of maternalmortalityormaternaldeathsinNigeriaingeneraland
Borno stateinparticular,asevidencedfromtherecordsobtained
from UmaruShehuHospital,Maiduguri(astatehospitalinthe
state capital.ThedatacontainsfrequencyofPRDinmonthsand
grouped intogynaecology,ante-natalandpost-natal,andlabour
obtained frommid-2009tomid-2017.Thestatisticalanalysisof
the datamayrevealtheextentofincidenceorepidemiologyof
PRD isinthestat
Cost Management Practice of Construction Firms and Its Influencing Factors: Lessons from Southwestern Nigeria
The growing need at maintaining steady cost projection of construction projects has been an issue of serious concern to both the clients and the construction practitioners on sites. Also, cost deviation from initial cost plan and cost budget has been prevalent on construction sites and no concerted efforts have been made at addressing this phenomenon. This study therefore examined the factors that are considered to be affecting the cost management practice of construction firms in the southwestern Nigeria and also proffered possible ways of ameliorating the factors. Using survey approach, one hundred copies each of structured questionnaires were distributed to clients, contractors and consultants on construction sites in the study area while 72, 77 and 78 copies were duly filled and returned by the respondents respectively. Relative Importance Index (RII) technique was used for the analysis. The results revealed that poor leadership and in appropriate management, inefficient deployment of resources, excessive wastage of materials on sites, complex payment mechanisms, theft of materials on sites and variation during construction works are the prevailing factors affecting construction cost management practice in the study area. It was concluded that extra focus should be placed on the identified factors with a
view to reducing cost of construction, enhancing construction performance and building confidence within the construction industry in the study area
Farmers’ Perception towards Organic-based Vegetable Produc-tion in Ilaro Agricultural Zone, Ogun State, Nigeria
It is well established that organic farming is a production system that sustain the health of the soils, ecosystems and people. This study assessed the small-scale farmers’ perception towards organic based vegetable production in Ilaro agricultural zone of Ogun state, Nigeria. A multi-stage sampling procedure was used in the selection of 85 respondents for the study. Data were obtained using a structured interview schedule. Data collected were analyzed using descriptive and inferential statistics. Results indicated that the mean age of the respondents was 30 years and 48.2% of the respondents were married. The major determinants of organic based vegetable production were information from extension agents (18.8%) and consumer’s requests (17.7%). Also, the respondent’s major perceived effect of organic vegetable production were; organic vegetable is environmentally friendly ( ̅χ=4.32) and free from any synthetic chemical ( ̅χ=4.10). There were significant association between educational status (χ2=1.923, df=5, p<0.05) and perceived effect of respondents. Also, there was positive and significant relationship between sources of information of organic vegetable production (r = 0.235*, p< 0.05), age (r = 0.195**, p< 0.05), and perceived effect of respondents. It was concluded that organic based vegetable production is a panacea for sustainable agriculture
Solutions of Chi-square Quantile Differential Equation
The quantile function of probability distributions
is often sought after because of their usefulness. The quantile
function of some distributions cannot be easily obtained by
inversion method and approximation is the only alternative
way. Several ways of quantile approximation are available, of
which quantile mechanics is one of such approach. This paper
is focused on the use of quantile mechanics approach to obtain
the quantile ordinary differential equation of the Chi-square
distribution since the quantile function of the distribution does
not have close form representations except at degrees of
freedom equals to two. Power series, Adomian decomposition
method (ADM) and differential transform method (DTM) was
used to find the solution of the nonlinear Chi-square quantile
differential equation at degrees of freedom equals to two. The
approximate solutions converge to the closed (exact) solution.
Furthermore, power series method was used to obtain the
solutions for other degrees of freedom and series expansion
was obtained for large degrees of freedom
Ordinary Differential Equations of the Probability Functions of the Weibull Distribution and their Application in Ecology
Weibull distribution has been applied to many areas in ecological studies and engineering. Application of the Weibull and other probability distributions in ecology are mainly in fitting ecological data which is very vital in revealing latent characteristics of the object of study. The use of the ordinary differential equations (ODE) in fitting has not been studied in ecological studies. Ordinary differential calculus was used to obtain the homogenous ODE of the probability density function (PDF), quantile function (QF), survival function (SF), inverse survival function (ISF), hazard function (HF) and reversed hazard function (RHF) whose solutions are their respective functions of the Weibull distribution. Different classes of ODEs were obtained. The novelty of this proposed method is applied to radiation data
Quantile Approximation of the Chi–square Distribution using the Quantile Mechanics
In the field of probability and statistics, the
quantile function and the quantile density function which is the
derivative of the quantile function are one of the important
ways of characterizing probability distributions and as well,
can serve as a viable alternative to the probability mass
function or probability density function. The quantile function
(QF) and the cumulative distribution function (CDF) of the
chi-square distribution do not have closed form
representations except at degrees of freedom equals to two and
as such researchers devise some methods for their
approximations. One of the available methods is the quantile
mechanics approach. The paper is focused on using the
quantile mechanics approach to obtain the quantile density
function and their corresponding quartiles or percentage
points. The outcome of the method is second order nonlinear
ordinary differential equation (ODE) which was solved using
the traditional power series method. The quantile density
function was transformed to obtain the respective percentage
points (quartiles) which were represented on a table. The
results compared favorably with known results at high
quartiles. A very clear application of this method will help in
modeling and simulation of physical processes
BOUNDARY PROPERTIES OF BOUNDED INTERVAL SUPPORT PROBABILITY DISTRIBUTIONS
This paper explores the properties of probability distributions as the random variables that defined those distributions approaching their bounded interval support. The models under study are: Kumaraswamy, Kumaraswamy Kumaraswamy, Kumaraswamy with beta and Kumaraswamy with beta distributions. The behavior of the probability density function of the random variables differs greatly at both the lower and the upper boundary points of the support. The results displayed in this research are the same for all the aforementioned pdfs and their cumulative distribution functions, survival functions and hazard functions. The results agreed with some well-known results in the literature. The probability density function, cumulative distribution function, survival function and hazard function approximate to the different values at the boundary points as the support approaches the boundary point
Classes of Ordinary Differential Equations Obtained for the Probability Functions of Kumaraswamy Inverse Rayleigh Distribution
In this paper, differential calculus was used to
obtain the ordinary differential equations (ODE) of the
probability density function (PDF), Quantile function (QF),
survival function (SF), inverse survival function (ISF), hazard
function (HF) and reversed hazard function (RHF) of
Kumaraswamy inverse Rayleigh distribution. The parameters
and support that define the distribution inevitably determine
the nature, existence, uniqueness and solution of the ODEs.
The method can be extended to other probability distributions,
functions and can serve an alternative to estimation and
approximation. Computer codes and programs can be used for
the implementation
Properties of Sequences Generated by Summing the Digits of Cubed Positive Integers
Having established some properties of sequences generated by summing the digits of squared positive
integers (Okagbue et al, 2015), we go a step further to explore the properties and characteristics of
sequences generated by summing the digits of cubed positive integers. The results are different from
summing the digits of squared positive integers. Two distinct sequences were obtained: one generated by
summing the digits of cubed positive integers and the other sequence as the complement of the first but
the domain remains the positive integers. The properties of these two sequences are discussed. The
properties include their decompositions, subsequences, algebraic, additive, multiplicative, divisibility,
uniqueness and ratios
Classes of Ordinary Differential Equations Obtained for the Probability Functions of Half-Cauchy and Power Cauchy Distributions
In this paper, the differential calculus (product
rule) was used to obtain some classes of ordinary differential
equations (ODE) for the probability density function, quantile
function, survival function, inverse survival function, hazard
function and reversed hazard function of the half-Cauchy and
power Cauchy distributions. The stated necessary conditions
required for the existence of the ODEs are consistent with the
various parameters that defined the distributions. Solutions of
these ODEs by using numerous available methods are new
ways of understanding the nature of the probability functions
that characterize the distributions. The method can be
extended to other probability distributions and can serve an
alternative to approximation especially the cases of the
quantile and inverse survival function
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