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How come the existence of ARCH effect is not a violation of Random Walk Hypothesis 3?
An ARCH (autoregressive conditional heteroscedastic) (1) model is: $r_t=\mu +a_t$, where $a_t=$return residual, and $\mu$ is the drift of the stock return $a_t=\sigma_t\epsilon_t$, where ...
Feb 26 at 1:35
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