Monitoring and statistical evaluation of critical operational and economic parameters of the selected group of tractors with high performance engines

The aim of this thesis is to find and evaluate critical operational and economic indicators in the group tractors statistically significant higher power class. These, they exhibit a high level of randomness, and therefore it is very difficult to predetermine. Of these operational and economic indicators were selected costs for repairs and maintenance that were obtained from invoices, financial statements and results of operations of farms. These costs were observed relative to the operating time of these tractor