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The variables were tested for unit roots.
To check for the stationarity of study variables, we first tested for unit root using the augmented Dickey and Fuller (1981) unit root test.
In order to avoid spurious regression of non-stationary series at level, all series are tested for unit root by employing the Im, Pesaran and Shin (IPS) and the ADF-Fisher chi-square panel unit root tests.
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Similarly, we test for unit root of all of the time series variables after first differencing.
Testing for Unit Roots in Heterogeneous Panels, DAE, University of Cambridge, Mimeo] to verify whether the firm size significantly affects firm growth.
We test for unit root and cointegration.14 The results of the ADF test on the levels suggest that the null hypothesis of unit root presence cannot be rejected at five percent significance level for all series, with the exception of the weighted average deposit rate.
Due to the exploratory character of this examination, as well as to the low cell frequencies, no significance tests for unit or specialty differences were carried out.
Reliability should be tested for those units whose data was calculated as being unreliable: 1 unit for caesarean section, 1 for full prenatal steroids, 1 for CPAP w/o mech.
While there is no systematic method to address this issue, one should be aware of this problem and eventually test whether metrics keep similar values when tested for different units of analysis.
We tested for influence of unit (level 2) on integrated care delivery.
We now proceed to test for a unit root in the idiosyncratic series.
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CEO of Professional Science Editing for Scientists @ prosciediting.com