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I am using the function wp.regression() and setting the alpha parameter to 0.05. However it's not clear whether it is computing a one-tailed or two-tailed test. Which test is default, and can I specify that one-tailed is required?
in Use of WebPower by (170 points)

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It only used two-sided test ~ An F-test is used.
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Thanks for your answer - do you know of any way I could conduct a one-tailed test instead with wp.regression()?
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