The Heckscher-Ohlin theorem states that if two countries produce two goods and use two factors of production (say, labour and capital) to produce these goods, each will export the good that makes the most use of the factor that is most abundant.
Additional models were built using three factors obtained from factor analysis instead of particles or tracer elements.
In the first part, the yield of Zn extraction was studied using four factors and four levels of the Box Behnken response surface design.
The authors report a calibration R of 0.96 and a standard error of calibration (SEC) of 0.26 using six factors and 26 spectra.
FADS showed high agreement with MBF based on manually defined blood TACs when using five to seven factors (ICC of 0.971 for MBF when using seven factors).
Significant differences between biological samples, cultivated on different carbon sources and on different accumulation periods, were evaluated using two factor analyses of variances (ANOVA), using SPSS 22.0.0 statistical software.
An orthogonal array (OA) was designed to evaluate the influence of eight factors using three levels of factor (21 × 37) variation with a L18 experimental matrix.
Using the HEXACO traits, we tested whether genetic covariance within each dimension was underpinned by a single common genetic factor using three distinct classes of multivariate model.
In such a landscape, multivariate statistical analysis has been used to differentiate among the main hydrochemical processes occurring in the area, using three different approaches of factor analysis: (i) major elements, (ii) trace elements, (iii) both major and trace elements.
In the optimization study for pretreatment using hexane, four factors of leaching with two levels including temperature (20 and 40°C), time (10 and 300 min), orange peel waste and hexane ratio (1 : 2 and 1 : 12), and the citrus waste size (homogenized and chopped) were investigated.
