This paper proposes robust estimators of the variogram, a statistical tool that is commonly used in geostatistics to capture the spatial dependence structure of data. The new estimators are based on the highly robust minimum covariance determinant estimator and estimate the directional variogram...

Access to credit in agriculture is an important mechanism for increasing farms' technological level and productivity, while the Fundo Constitucional do Centro-Oeste (FCO) policy also includes a reduction in regional disparities. In this study, we aimed to investigate whether the FCO resources in...