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Re: st: Variance Ratio Test

From   Nick Cox <>
Subject   Re: st: Variance Ratio Test
Date   Thu, 19 Apr 2012 20:51:41 +0100

Definitely not. -sdtest- pays no attention even to whether data are a
time series, let alone their dependence structure.

Others can advise on the best way to proceed. You need a time
series-specific command.


On Thu, Apr 19, 2012 at 8:23 PM, Mark Bailie <> wrote:

> Dave, many thanks for getting back to me.
> I'm a statistics beginner, and would like to test for the random walk in a series of stock prices.
> I plan to use the varaince ratio test to test my variables variance against that of a random walk (1).
> Is this just code:  sdtest myvar ==1
> And if so how do I interpret how the results from a the sdtest?  i.e. how do I know if it has rejected the null hypothesis.

Airey, David C []

> In what context?
> See -sdtest- and -robvar-.

>> hi, I'm slightly confused about how to test variables for the variance ratio test in stata?

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