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Financial performance is a random process which could be decomposed in the particular indices. Often the influence function is of a non-linear form. For a performance analysis is important knowledge of the indices influence. One of the possible random influence measure is variance. However, the problem is more complicated under non-linear function of indices. There is in the paper derived a problem of the non-linear delta method approximation of variance decomposition. Financial performance variance decomposition in metallurgy sector is verified and investigated.
Keywords: financial performance, delta approximation method, variance decomposition© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.