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A nonstationary dividend yield, having a unit root, is seen as proof of bubbles (Craine 1993). This inference is not … valid. A sufficient condition for the absence, respectively presence of bubbles is the uniform divergence, respectively … equilibrium dividend yield is a random walk without a deterministic trend or drift, but bubbles are still absent …
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The study reports empirical evidence that artificial neural network based models are applicable to forecasting of stock market returns. The Nigerian stock market logarithmic returns time series was tested for the presence of memory using the Hurst coefficient before the models were trained. The...
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