Before you trust a CSV
Check the shape, keys, types, and coverage before a convenient export becomes an unquestioned source of truth.
Read the checklist →A small notebook for better data
Make sense of the table.
Then tell the story.
Practical notes on data quality, everyday analysis, and charts that explain more than they decorate.
Start with a CSV check →An illustrative six-day series, not a live operational metric. Download the sample CSV.
Start with the fundamentals
THREE SHORT READSMissing is not zero
Separate absent observations from real zeroes. Make the treatment of missing values a decision you can explain.
Work through an example →Choose the question first
Use a small set of chart types well, label the units, and leave uncertainty visible.
Build a clearer chart →Small notes.
Explicit assumptions.
InsightzLoop is a compact collection of educational notes about working with tabular data. Examples are deliberately small enough to inspect. Sample datasets are synthetic and do not describe real people, customers, or businesses. This site has no accounts, advertising, or analytics trackers.