In clinical research, parameters required for sample size calculation are usually unknown. A typical approach is to use estimates from some pilot studies as the true parameters in the calculation. This approach, however, does not take into consideration sampling error. Thus, the resulting sample size could be misleading if the sampling error is substantial. As an alternative, we suggest a Bayes...

A highly accurate statistical model has been developed to determine the exact type of chamomile used in the production of commercial herbal products. The model was developed from accurate GC/MS data obtained with an Agilent 7890 GC and Agilent 5975 GC/MSD. Quality control of the samples was performed by Principal Component Analysis (PCA) and a sample class prediction model based on Partial Leas...

The paper focuses on the estimation of customer default amoung the small and medium enterprises (SME). Based on the literature on credit scoring modelswebuild a logistic regression model which is widely used by commercial banks. Our models predicting customers’ default on their payables to suppliers are estimated on a sample of a customer portfolio of 905 SME clients. Based on the analysis the ...

This paper looks into the overall energy pattern in rural China and the possible reasons behind based on an assessment of available data sources. Commercial energy consumption by rural residents is disproportionately lower than that by their urban counterparts. Moreover, biological matters are the dominant source of household fuels in rural areas. Variations in energy consumption are closely re...

A nonlinear, dynamic empirical model, based on a Volterra-like approach, was previously proposed by the authors for the time-oriented characterization of sample/hold (S/H) and analog-to-digital conversion (ADC) devices. In this paper, the experimental procedure for model parameter measurement is presented, as well as techniques devoted to the implementation of the model in the framework of the ...

When food manufacturers specify a maximum limit for the amount of foreign material (FM) in the lot, handlers estimate the true percent FM in a commercial lot by measuring FM in a small sample taken from the lot before shipment to a food manufacturer. Because of the uncertainty (variability) in FM among samples taken from the same lot, it is difficult to obtain a precise estimate of the true FM ...

silicon and aluminum sources are most important reactants in the synthesis of zeolite. the use of the silicon source has an important effect on the crystallization of zeolites. also, it can change the properties of the end product. this work reports the influence of three common commercial silica sources such as colloidal silica (ludox am-30), fumed silica and water glass on the crystallinity o...