In one or another degree next:

- is inherent all these approaches intercommunication and distinctions between concepts «risk» and «vagueness» is not rotined expressly;

- risk individuality, subjectivity of his display, is not marked;

- the spectrum of criteria of risk estimation is limited, as a rule, by one index.

In addition, plugging in the indexes of estimation of risk of such elements, as alternative costs, loss of profit and meeting in literature, in opinion of author, beside the purpose, as they characterize a profitableness in a greater degree, than risk.

An author suggests to examine a risk as possibility of losses, arising up because of necessity of acceptance of investment decisions in the conditions of vagueness. It is especially underlined thus, that concepts «vagueness» and «risk» not identical, as it is frequently considered, but possibility of offensive of unfavorable event it is not necessary to take to one index – probability. The degree of this possibility can be characterized different criteria:

it is probability of offensive of event;

it is a size of deviation from the forecast value (scope of variation);

it is dispersion; expected value; mean quadratic deviation; coefficient of asymmetry; excess, and also in a number of other mathematical and statistical criteria.

As a vagueness can be set its different kinds (probabilistic distributing, interval vagueness, subjective probabilities and the displays of risk are extraordinarily various, in practice it is necessary to use all arsenal of the transferred criteria, but in general case an author suggests to apply and mean quadratic deviation as most adequate and well showing oneself in practice criteria. In addition, it is especially marked that at the estimation of risk it is necessary to take into account individual tolerance to the risk, which is described crooked indifference or utility. Thus, an author recommends to describe a risk three afore-mentioned parameters:

The comparative analysis of statistical criteria of risk estimation and their economic essence is presented in a next paragraph.

Probability of event is attitude of number Toward cases of favourable ends, to the incurrence of all possible ends.

Probability of offensive of event can be certain or subjective method.

The objective method of determination of probability is founded on frequencies, which this event is with. For example, falls of «eagle» or at throwing an ideal coin

A subjective method is based on the use of subjective criteria (judgement of estimating, his personal experience, estimation of expert) and probability of event in this case can be different, being by different experts.

In connection with these distinctions in approaches it is necessary to mark a few nuances:

At first, objective probabilities have little general with investment decisions which can not be repeated oftentimes, while probability of fall of «eagle» is equal to 0,5 at the amount of throwing up, and, for example, 5 «eagles» and can fall out at throwing up.