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Full-Text Articles in Statistical Theory
Inventory Models For Perishable Items Under Markdown Policy, Nurzahara Atika Kamaruzaman
Inventory Models For Perishable Items Under Markdown Policy, Nurzahara Atika Kamaruzaman
Student Works (2020-2029)
As expected, the demand for a fresh product depends on how fresh it is, therefore, it is important to take expiration date into consideration. Based on marketing and economic theory, several factors such as price, inventory level and advertisement play a crucial role in influencing the demand. Hence, we study the effect of these factors in influencing the demand in the inventory model. Since the demand for perishable product declines over time, markdown policy is offered to increase the demand and profit while reducing the inventory. Salvage value is incorporated to the deteriorating units. In this research, we extend previous …
Statistical Modelling And Inference For A Class Of Bivariate And Related Distributions., Ng Choung Min
Statistical Modelling And Inference For A Class Of Bivariate And Related Distributions., Ng Choung Min
Student Works (2010-2019)
This thesis considers bivariate extension of the Meixner class of distributions by the method of generalized trivariate reduction so that the marginal distributions have different parameters; in particular, a new bivariate negative binomial (BNB) distribution is examined. Different marginal parameters allow flexibility in statistical modelling and simulation studies when different marginal distributions and a specified correlation are required. The multivariate extension of this class of distributions is also given. Specifically, various interesting properties of the proposed BNB distribution, such as canonical expansion and quadrant dependence are examined. In addition, potential applications of the proposed distribution, as a bivariate mixed Poisson …
Some Problems Of Outliers In Circular Data., Ali H.M. Abuzaid
Some Problems Of Outliers In Circular Data., Ali H.M. Abuzaid
Student Works (2010-2019)
This study considers three problems of outliers in circular statistics. The first problem is an attempt to use the standard outlier detection procedures for linear data set by approximating circular variables by linear variables. This is possible for large values of concentration parameter. Series of simulation studies are carried out to specify the accepted value of the concentration parameter so that the von Mises distribution can be approximated by normal distribution. The second is the problem of outliers in circular samples. Two numerical tests of discordancy are proposed to identify outliers. The test statistics are based on the summation of …