Search

Data cleaning and transformation

Aim To ensure a clean data file, from which errors have been removed. Requirements Data of all variables in the files are cleaned, not just those used in statistical analyses. For cleaning processes and validations during data collection, please…

https://aph-qualityhandbook.org/set-up-conduct/process-analyze-data/3-2-quantitative-research/3-2-1-data-processing/data-cleaning-and-transformation/

Initial data analysis

the variable is not normally distributed, then a transformation could be considered (for instance a logarithm transformation) to see whether this improves the distribution. However, note that results with transformed variables might be more…

https://aph-qualityhandbook.org/set-up-conduct/process-analyze-data/3-2-quantitative-research/3-2-2-data-analysis/initial-data-analysis/

Data provided by third parties

and values that are not permitted. Has data transformation been applied? If so, which one? Does the data supplier use a quality assurance system? If so, what is the area covered by the quality system? Data that are still being/are to be collected…

https://aph-qualityhandbook.org/set-up-conduct/methods-data-collection/2-2-quantitative-research/2-2-5-data-collection/data-provided-by-third-parties/