The lockdown that followed the 2020-2021 pandemic resulted in an abrupt surge in missing and potentially unusable input data for CPI calculations. In order to calculate and publish the CPIs, considerable strain was exerted on the established imputation methods. Could established procedures fully accommodate the sheer quantum of missing data? Could novel situations brought about by the lockdown be adequately addressed by existing, default imputation mechanisms? Were interventions or new procedures required? In effect, the lockdown called the prudence of long-standing imputation procedures into question.

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