The yield curve, which plots the yield of Treasury bonds against their maturity, is one of the most closely watched financial indicators.1 Many market observers carefully track the yield curve’s shape, which is typically upward sloping and somewhat convex. At times, however, it becomes flat or slopes downward (“inverts,” in Wall Street parlance), configurations that many business economists, fi...

Several sigmoidal functions (logistic, Gompertz, Richards, Schnute, and Stannard) were compared to describe a bacterial growth curve. They were compared statistically by using the model of Schnute, which is a comprehensive model, encompassing all other models. The t test and the F test were used. With the t test, confidence intervals for parameters can be calculated and can be used to distingui...

A fundamental aspect of predictive microbiology is the shape of the microbial growth curve and many models are used to fit microbial count data, the modified Gompertz and Baranyi equation being two of the most widely used. Rapid, automated methods such as turbidimetry have been widely used to obtain growth parameters, but do not directly give the microbial growth curve. Optical density (OD) dat...

Despite the widespread popularity of growth curve analysis, few studies have investigated robust growth curve models. In this paper, the t distribution is applied to model heavy-tailed data and contaminated normal data with outliers for growth curve analysis. The derived robust growth curve models are estimated through Bayesian methods utilizing data augmentation and Gibbs sampling algorithms. ...

Background : Infants growth is one of the most important sources of information for the diagnosis of growth retardation and malnutrition in children. The aim of this study was to investigate factors associated with reduction of height and weight of infants less than 2 years of Alashtar township of Lorestan province. Materials and Methods: This research was a cross-sectional study. The statisti...

2 W. J. Crozier, J. Gen. Physiol., 10: 53, 1926. 3 C. S. Minot, "Age, Growth and Death," G. P. Putnam 's Sons, New York, 1908. 4 C. M. Child, " Senescence and Rejuvenescence," University of Chicago Press, 1915. 5 Sewall Wright, J. Amer. Statis. Assoc., 21: 493, 1926. was found by Davidson6 to give a good fit to growth in weight W of dairy cattle. Equation (3) was applied by Weymouth7 with excel...

The experimentally obtained data, growth curve, percentage of labeled mitoses curves, and continuous labeling curves have been analyzed by means of a computer method based on alternative mathematical models for the cell kinetics. The experimental doubling time determined from the growth curve is 10, 25, and 75 hr in the 5-, 6-, and 8-day tumors, respectively. From the models, growth fractions o...

A minute small-cell lung cancer measuring 8 x 5 mm was detected and serially imaged by computed tomography for about a year preceding resection. Although this solid nodule showed a short overall doubling time (76 days), the growth curve included an early phase without apparent growth prior to the phase of rapid growth. Accordingly, lung cancer cannot be ruled out when a small nodule (<10 mm) do...