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عمومی::
فرض صفر
The explanatory power of the models reported is quite high and can exceed a half, and the F-test for the joint significance of the regressors always rejects the null hypothesis of no influence.
Firstly, we examine the autocorrelation of returns which are assessed via the Ljung-Box (Ljung and Box, 1978) test that has the null hypothesis of no autocorrelation.
Secondly, the runs test (Wald and Wolfowitz, 1940) and the Bartels test (Bartels, 1982) are employed to determine whether returns are independent, which has independence as the null hypothesis.
Thirdly, we employ the variance ratio test (Lo and MacKinlay, 1988), which under the null hypothesis, the price process is a random walk and the variance of the price difference of order q equals p times the variance of the first difference.
The null hypothesis is that the data generating processes are i.i.d.
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حقوق::
فرضیه صفر
[See also follow-up article discussing the null hypothesis]
Terms like "variance," "correlation," "statistical significance," "probability" or the "null hypothesis."
, and the presumption of innocence can be likened to the "null hypothesis."
Like the null hypothesis, the starting point in a criminal trial is that defendant is not guilty, and in statistical terms, that the connection you've set out to establish is just not there.
Returning to our refinery hypothetical, we form our null hypothesis.
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