Positive and negative error limits of inconsistencies of trade balance
The formulas allowing calculating the components of the inconsistencies of trade balance are given. Random error is associated with the errors in weighing and coefficient of variation of the mass fraction of the ore per month. The limits of permissible random error, depen ding on the coefficient of variation are given. Methodical error of the inconsistency (depends on the proportion of omitted results when analysing which go beyond the permissible limits for parallel analyses, as well as asymmetry in the distribution of the mass fraction of ores and products of enrichment. Asymmetry in the distribution of mass fraction causes the probable systematic inconsistency. As a result, the error becomes predominantly positive or negative, and the margin of the inconsistency should have different positive and negative values.