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"warnings": [ "Estimation failed for group 16 in time period 12: A required group-period covariate design is singular. Setting ATT to NA for this cell.", "Estimation failed for group 16 in time period 1: A required group-period covariate design is singular. Setting ATT to NA for this cell.", "Estimation failed for group 16 in time period 2: A required group-period covariate design is singular. Setting ATT to NA for this cell.", "Estimation failed for group 16 in time period 3: A required group-period covariate design is singular. Setting ATT to NA for this cell.", "Estimation failed for group 16 in time period 4: A required group-period covariate design is singular. Setting ATT to NA for this cell.", "Estimation failed for group 16 in time period 5: A required group-period covariate design is singular. 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