Part 5: How do you prepare the data? · Module 11
Clean before you compute
How Do You Check Data Quality?
CNA is unforgiving of dirty data, because it reads every row as a real case and takes each one seriously. Before you analyse anything, walk this checklist:
CNA will cheerfully find a crisp, beautiful pattern in mislabelled data and present it with total confidence, like a witness who is very sure and completely wrong. The method cannot tell a typo from the truth. Cleaning is not optional housekeeping. It is part of the analysis.
What You Will Be Able to Do
- List the data-quality checks to run before any analysis.
- Recognise a logical contradiction in coded data.
- Explain why clean data is part of the analysis, not a chore before it.