2. For the purposes paragraph 1, competent authorities shall compare, on the basis of a sample of time series:
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(a)
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the volatility and other distributional properties of the scenario of future shocks applied to a given risk factor in the calculation of the partial expected shortfall measures;
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(b)
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the volatility and other distributional properties of the returns observed for the given risk factor.
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Competent authorities shall do the assessment referred to in paragraph 1 on the basis of both the period referred to in Article 325bc(4), point (c), of Regulation (EU) No 575/2013 and the period of financial stress referred to in Article 325bc(2), point (c), of that Regulation.