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Check ChatGPT before trusting an Excel analysis
Leila Gharani uses a messy workbook to explain guardrails, basic checks and reconciliation.
What it covers
Leila Gharani's companion article describes inspecting sheets, checking basic totals and reconciling AI summaries to transactions. It targets Excel users reviewing analysis across related tables. Her example also tests whether ChatGPT admits when a question lacks supporting data.
A useful prerequisite
Microsoft's separate merge guide explains matching columns and join types. Review those relationships before assessing combined totals: selecting the wrong join can change which rows survive, while incompatible column types can spoil matches.
This July 2026 example is one creator's test, not a guarantee for your workbook; anonymize sensitive data first.
