regressioni spurie unit root unit root unit roots regressioni spurie regressioni spurie unit root regressioni spurie regressioni spurie regressioni spurie https://en.wikipedia.org/wiki/Unit_root a unit root Unit Root Processes unit roots Wikipedia notes the debate regressioni spurie regressioni spurie first differences regressioni spurie regressioni spurie regressioni spurie regressioni spurie http://en.wikipedia.org/wiki/Unit_root regressioni spurie unit root unit roots regressioni spurie en:Unit root Definition of I(1) a unit root unit roots unit root regressioni spurie regressioni spurie regressioni spurie