If the t statistic for the presence of a unit root in a variable is −7.22 and the 5% critical value is −2.86, there is strong evidence against a unit root in the variable.

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The t statistic value of -7.22 is much lower than the 5% critical value of -2.86. This indicates that there is strong evidence against a unit root in the variable, which means that the variable is stationary.

If the T Statistic for the Presence of a Unit