This note is concerned with a validity-related limitation of the widely available and used index “alpha if item deleted” in the process of construction and development of multiplecomponent measuring instruments. Attention is drawn to the fact that this statistic can suggest dispensing with such scale components, whose removal leads to loss in criterion validity while maximising the popular coef...

Equations developed for packed columns may be used to predict the overall heat transfer coefficient and friction loss in massecuite reheaters. The results seem to indicate that exchangers with the tubes staggered give higher heat transfer rates than those with the tubes in line.

in order to evaluate the competitive ability (ca) of canola cultivars against wild mustard, two experiments were conducted at the gorgan institute in iran during the 2005-2007 cropping seasons. the experimental factors were canola cultivars (1st year: zarfam, option500, hayola330, hayola401, talayh, rgs003 and sarigol; 2nd year: zarfam, hayola330, rgs003 and option500) and weed density (1st yea...

The available studies for estimating the characteristics of hydraulic jump are only for artificial or natural beds, and very limited researches have simultaneously considered artificial and natural beds. The aim of this study is to present comprehensive equations and models for predicting the characteristics of hydraulic jump in artificial and natural rough beds with various dimensions, arrange...

estimation of the amount of soil loss measurement of field indicators is a low-cost method, is easy to learn and can be simply applied. in order to measure and make assessment of soil loss amount by field indicators method in shahrak watershed, first map of the work units was prepared and then, measurements of the relevant field indicators were carried out within these units. then, epm model wa...

The rational method is derived as a special case of kinematic wave flow. The definition of runoff coefficient is expanded from the flow-based ratio into volume-based ratio between the volumes under runoff hydrograph and rainfall hyetograph. The new method presented in this paper provides a dimensionless approach to theoretically derive the runoff coefficients for both the conventional two-flow ...

Recent research suggests that optimistically biased earnings forecasts issued by analysts are attributable to analysts minimizing symmetric, linear loss functions. We test an alternative explanation, namely that analysts have asymmetric loss functions. Theory predicts that if loss functions are asymmetric then forecast error bias depends on forecast error variance, but not necessarily on skewne...

A well known difficulty in estimating conditional moment restrictions is that the parameters of interest need not be globally identified by the implied unconditional moments. In this paper, we propose an approach to constructing a continuum of unconditional moments that can ensure parameter identifiability. These unconditional moments depend on the “instruments” generated from a “generically co...

We propose a framework for classification learning based on generalized learning vector quantization using statistical quality measures as cost function. Statistical measures like the F -measure or the Matthews correlation coefficient reflect better the performance for two-class classification problems than the simple accuracy, in particular if the data classes are imbalanced. For this purpose,...