Reproducibilitive process is characterized by small changes in the values ​​chosen for different time intervals.

Developing of qualitative characteristics of TP using the above mentioned criteria could be made with the help of statistical analysis of i quantity of realizations , change of random function of performance indicator.

If we analyze ensemble of i’th realizations and calculate to each of them the mathematical expectation , standard deviation and dispersion and determine the type of the distribution law of values of index , then we can determine the above mentioned criteria of TPs. Reproducibility of TP could be determined by ergodic random process of changing the values , which is conducted by analyzing the values ​​of autocorrelation function . Sustainability of TP is determined by the values and of function change random process . Also with the help of and we can determine additional qualitative characteristics of TP: intention and accuracy.

The intentionof TP is determined by the nature of change in values , and accuracy - .

Thus, if the result of statistical analysis of several samples indicator for every i’th of which we obtain values , , , and also determine the distribution law , then on the basis of the collected data, the following conclusions concerning the nature of TP, which was examined could be

:а) if the following conditions satisfy: = const; = = const; obey the normal distribution law, then TP is considered to be stable;

б) if the following conditions satisfy: = const; = = const then TP is considered to be sustainable;

в) if the following condition satisfy = = const then TP is considered to be accurate;

г) if = const then TP is considered to be intended.

Signs of reproducibility of TP we will establish due to the data of laboratory work #2.