introduction: soil aggregate stability is a key factor in soil resistivity to mechanical stresses, including the impacts of rainfall and surface runoff, and thus to water erosion (canasveras et al., 2010). various indicators have been proposed to characterize and quantify soil aggregate stability, for example percentage of water-stable aggregates (wsa), mean weight diameter (mwd), geometric mea...

the quantitative structure–property relationship (qspr) method is used to develop the correlation between structures of crude oil hydrocarbons (80 compounds) and their boiling point and water solubility. sub-structural molecular fragments (smf) calculated from structure alone were used to represent molecular structures. a subset of the calculated fragments selected using stepwise regression (fo...

Multiple regression is an extension to simple regression in several ways. First, instead of examining a linear relationship bewteen two measurements, Xi and Yi, multiple regression aims to explain relationships between p measurements of an object i, denoted as (Xi,1, ..., Xi,p) and Yi. Based on a sample of n points, with each point having measurements (Yi, Xi,1, ..., Xi,p), multiple regression ...

in this paper, a new formula is applied for the calculation of gravity anomalies from a cylinder model representing a geological body. compared to conventional methods, this new development allows the cylinder to be freely oriented in space. 38 gravity forward models are produced each of which anomaly attributes are calculated. then a linear relationship is established between attributes and so...

Regression analysis is a widely used statistical technique to build model from set of data on two or more variables. Linear regression based linear correlation, and assumes that change in one variable accompanied by proportional another variable. Simple regression, bivariate for predicting the value (predictor); however, multiple which enables us analyse than predictor variable, commonly used. ...