Abstract
The study investigates the investment value of global stock markets by a portfolio construction method combined with bootstrapping neural network architecture. A residual sample will be generated from bootstrapping sample procedure and then incorporated into the estimation of the expected returns and the covariant matrix. The outputs are further processed by the traditional Markowitz optimization procedure. In order to examine the efficacy of the proposed approach, the illustrated case was compared with traditional Markowitz mean–variance analysis, as well as the James–Stein and minimum-variance estimators. From the empirical results, it indicated that this novel approach significantly outperforms most of benchmark models based on various risk-adjusted performance measures. It can be shown that this new approach has great promise for enhancing the estimation of the investment value by Markowitz mean–variance analysis in the global stock markets.
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Appendix 1: The Elman neural network
Appendix 1: The Elman neural network
In this study, we adopt the Elman network (implemented by Matlab software); this is a two-layer network with feedback from the first-layer output to the first-layer input, with the recurrent connection allowing the network to both detect and generate time-varying patterns. The two-layer Elman network is specified as follows.
where a1 (t), which is the output vector of the recurrent hidden layer, represents the hyper-tangent transference of the input vector, p, and the context unit, LW1,1; tan sig refers to the hyper-tangent activation function; IW1,1 represents the input weight; and b1 is the bias vector.
In the second part of Eq. (9), a2 (t), which is the output vector of the output layer, represents the linear transference of the hidden output vector, a1 (t), and the bias vector, b2; purelin refers to the linear activation function; and LW2,1 represents the hidden weight matrix.
A BFGS quasi-Newton method is used for network training to update the weight and bias values. Given that the network can store information for future reference, it is able to learn temporal patterns as well as spatial patterns.
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Hsiao, HF., Huang, JC. & Lin, ZW. Portfolio construction using bootstrapping neural networks: evidence from global stock market. Rev Deriv Res 23, 227–247 (2020). https://doi.org/10.1007/s11147-019-09163-y
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DOI: https://doi.org/10.1007/s11147-019-09163-y