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Unit root test
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<p>In <a href="/facts/Statistics/DNPsKGYU">statistics</a>, a unit root test tests whether a <a href="/facts/Time_series/fSXPR817">time series</a> variable is non-stationary and possesses a <a href="/facts/Unit_root/huh7xB9P">unit root</a>. The null hypothesis is generally defined as the presence of a unit root and the alternative hypothesis is either <a href="/facts/Stationary_process/vozdgfEX">stationarity</a>, <a href="/facts/Trend-stationary_process/FaX9GYFN">trend stationarity</a> or explosive root depending on the test used. </p>