Before analysis, data were cross-checked for entry error and range checks.
Electronic range checks and validation rules were utilized to eliminate erroneous data entry and artifacts in numeric values.
Table 2 MesoWest Quality Control Flags (QFLAG QFLAG Descriptionn -1 Suspect One of the variables in an observation did not pass the "range checks".
Source data in the data set passed the quality control; the control content included format checks, missing data checks, threshold checks, major range checks, internal consistency checks, comprehensive analyses of quality control, and data quality mark.
To minimise errors, logical range checks were in place so that the investigators would be alerted if an attempt was made to enter data values outside the expected ranges.
When the data were computerized, the data entry program applied a series of range checks, and this precluded typographical errors.
A series of internal consistency and range checks helped to identify any illogical responses and to verify that responses adhered to skip patterns in the questionnaire.
The data-cleaning process included automated range checks, with change requests displayed immediately to the user.
