=: ( + ) 100 %, Where -

=: ( + ) 100 %, where - is true-negative results, - is false positive results of Ds in percentage and the above the percent also is expressed, the the sign is more specific. Diagnostic efficiency can be calculated as follows: J = ( + ): ( + + + ) 100 % Probability that any result (a sign, The symptom) can be recognised by norm or a pathology depends on three The reasons: 1) from the chosen value of norm; 2) from a relative proportion Two populations of the people for example healthy and sick (disease + Morbidity of the population); 3) from degree of "overlapping" of an indicator - Imposings of fields of an arrangement of three a standard deviation. In some cases the forecast indicator is considered also - value (): = : ( + ) 100 % It is possible to estimate (about) percent of interrelation with treatment, influence of any factor: Interrelation of signs = ( ) - ( ): ( ) + ( ). But it is a special problem and to discuss it it is possible only after careful studying of statistics. http://www.