most developing countries have achieved productivity growth in economic sectors like agriculture for more than 30 years. universities and governmental research centers have tried to generate knowledge with direct social and economic effects during these decades. so, productivity and production growth can be attributed to technological changes made possible through investment in agricultural res...

We prove the first fundamental theorem of invariant theory for the action of the special orthogonal group on m tuples of matrices by simultaneous conjugation. A basic relation between polynomial invariants is also studied.

Let Md(k) denote the space of d×d-matrices with coefficients in an algebraically closed field k. Let X be an orbit closure in the product [Md(k)] t equipped with the action of the general linear group GLd(k) by simultaneous conjugation. We show that X is regular at any point y such that the orbit of y has codimension one in X. The proof uses mainly the representation theory of associative algeb...

The generating function for words with several simultaneous maj weights is given. New maj-like Mahonian statistics result. Some applications to integer partitions are given.

In comparing two treatments with failure time observations, con®dence bands for the `̀ difference'' of two survival curves provide useful information about a global picture of the treatment difference over time. In this note, we propose a rather simple procedure for constructing such simultaneous con®dence intervals. Our technique can also be used in the one-sample case, which has been extensive...

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in the recent years, renewable energy sources are an important component of world energy consumption. gdp is one of the main measures of a country’s economic activity. most of the studies examine the impact of renewable energy consumption on gdp with single equation model and the others use dynamic panel data. since the granger causality analysis’s findings of this paper establish bidirectional...

Preparing the books to read every day is enjoyable for many people. However, there are still many people who also don't like reading. This is a problem. But, when you can support others to start reading, it will be better. One of the books that can be recommended for new readers is estimation of simultaneous equation models with error components structure lecture notes in economics and mathemat...

In this paper, short-run and long-run relationships between real interest rates in G-7 countries are analyzed. Using the model that follows the dynamic simultaneous equation models of Pesaran (1997) and Hsiao (1997), we find evidences of long-run relationships between the US real interest rate and the other six G-7 countries. However, the estimated parameters do not support the real interest ra...

F sales forecasts for retailers can be improved if we incorporate cost of goods sold, inventory, and gross margin (defined by us as the ratio of sales to cost of goods sold) as three endogenous variables. We construct a simultaneous equations model, estimated using public financial and nonfinancial data, to provide joint forecasts of annual cost of goods sold, inventory, and gross margin for re...