Three methods reported in the literature are subject to comparative analysis in the present paper: 1. Classic method [1,5]; 2. Merce E., Merce C.C. Method[2,3]; 3. Merce E., at al Method[4]; It is shown that in the case of the first two methods mentioned above, the attempts to distribute...

The standard gravity model of aggregate migration erroneously assumes homogeneity, quasi-symmetry, and (log) linearity. As a result, estimation of the model using, say, the convenient OLS estimator is plagued by omitted-variables and misspecification biases. This paper, therefore, presents...

This paper focuses on several estimation methods for SAR- models in case of missing observations in the dependent variable. First, we show with an example and then in general, how missing observations can change the model and thus resulting in the failure of the 'traditional' estimation methods....

Viticulture is an important activity in Romania, with a tradition since ancient times, it is ideal to cultivate especially for its geographical position and pedo-climatic conditions. In Romania, the area under vines is decreasing between 2015 and 2021, while total grape production is increasing...