How to prepare a dataset for research and analysis
Cleaning is part of your method. Whether you are a student with survey responses, an analyst with exported records, or an organisation consolidating field data, you need clean data and a record of what was done to it.
Clean a file freeCSV, XLSX or XLS · no account needed
Keep the raw data raw
Omixa never modifies the file you upload. It produces a separate cleaned copy, so the original stays available as your source of truth.
Keep a record of every change
A before and after preview and a change log show each rule that ran and how many cells it changed, with the source row for each change. That gives you something concrete to cite when someone asks how the data was prepared.
Decide what is ambiguous yourself
Omixa applies safe fixes and flags the rest: impossible ages, mixed date conventions, unfamiliar category spellings, values that do not fit their column. It does not fill gaps with estimates unless you opt in, which keeps analytical decisions with the analyst.
When you handle many files
Omixa Pro cleans up to 20 files in one batch, each cleaned and reported on separately, and produces a PDF quality report. Pro history stores scores and change summaries, never your rows.
Steps
- Keep your original export untouched.
- Upload it and read the findings.
- Apply safe fixes and resolve flagged values.
- Save the cleaned file and the change log together.
Common questions
Is Omixa suitable for survey data?
Yes for the cleaning side: consistent categories, dates, numbers and missing-value handling, with a change log. You still decide how to analyse it.
Can I show how my data was cleaned?
The change log and before and after preview record the rules applied. Pro adds a PDF quality report.
Do I need an account?
Not for Free cleaning. Pro features need an account.
Related guides
- Handle missing valuesSpot blanks and placeholders like N/A, null and dashes, and decide whether to leave them or fill them. Omixa never fills gaps with estimates unless you ask.
- Data quality assessmentGet a data-quality score and report for a spreadsheet: what was found, what was fixed, and what still needs review. Practical, explainable, no guesswork.
- Clean Excel filesClean an Excel workbook: trim spaces, remove duplicate rows, fix dates and formats, and get a quality report. See exactly what is kept and what is not.