The structural tracking error minimization (STEM) approach produces stable tracking portfolios out-of-sample in the crucial investment period. Full version:
Today, the investment into indices has become a widely used strategy in portfolio management. While Index Funds and ETFs try to represent the performance of a single index, other portfolio strategies use indices as portfolio components to concentrate on the allocation task. Because an index cannot be purchased directly, it has to be rebuilt. This is called index tracking.
In today’s Portfolio Management many strategies are based on the investment into indices. This is a consequence of various empirical studies that show that the allocation over asset classes, countries etc. provides a greater performance contribution than the selection of single assets. For every portfolio containing indices as components the problem is that an index cannot be purchased directly. So it has to be rebuilt. This is called index tracking. The goal is to approximate the risk and return profile of an index.