How to Do Data Analysis in Excel

Data analysis in Excel starts with a clean table and a clear question. The tools are familiar: filters, formulas, pivot tables, charts, and summary checks. The hard part is keeping the analysis tied to a real decision instead of producing a noisy workbook.

Use Excel when the data is small enough to inspect, the business logic matters, and stakeholders need a spreadsheet they can review.

Start with the question

Before building formulas, write the question in plain language:

• Which expense category increased this month?
• Which sales owner has the most late follow-ups?
• Which projects are blocked?
• Which clinic department is driving supply spend?

That question decides the columns, filters, summaries, and charts you need.

Clean the source table

Step 1. Use one header row

Each column should have a clear name such as Date, Department, Vendor, Amount, Owner, Status, or Category.

Step 2. Use one record per row

Do not mix totals, notes, and blank separator rows inside the source data.

Step 3. Fix data types

Dates should behave like dates, amounts should behave like numbers, and statuses should use consistent labels.

Step 4. Add fields that support review

Analysis usually needs dimensions like department, owner, category, month, status, source, or location. If those fields are missing, the summary will be weak.

Analyze with formulas and pivots

Use formulas for focused checks. For example, total expenses for one department:

Use pivot tables when you need grouped summaries such as amount by department, count by status, or revenue by month.

For clinic operations, an expense tracker for clinics can feed summaries by department, vendor, supply type, and month without rebuilding the analysis every time.

Turn the analysis into a review

A useful analysis page usually has:

1. A short answer at the top.
2. A few KPI totals.
3. One or two charts.
4. A detail table for the rows that need action.
5. Notes explaining assumptions or exclusions.

Common analysis mistakes

The Griddy way

Data analysis gets slow when cleanup, formulas, pivots, and charts all need to be coordinated manually.

"Analyze this clinic expense table by department and month, flag unusual vendors, and create a review summary with the top cost changes."

Griddy can clean the table, build the summaries, and turn the analysis into a review-ready spreadsheet.

Start with a question and a check

Write the decision the analysis should support before choosing a chart or pivot. Define the unit of observation, the time window, and the filters, then inspect missing values, duplicates, and unusual records. Keep an untouched source tab and document each transformation in a working tab. Validate totals against a known control total and show sample sizes beside rates or percentages. This makes the analysis reproducible and helps a reviewer distinguish a real pattern from an import or filtering mistake.

Sources

• Microsoft Support: Create a PivotTable to analyze worksheet data
• Microsoft Support: About Power Query in Excel