Datasets

A dataset in Statios is a tabular structure with rows (observations) and columns (variables), plus rich metadata: variable labels, value labels, measurement levels, missing-value codes.

On the web

In the web app, files open through the file picker or drag & drop and are processed entirely on your device — nothing is uploaded anywhere. Imported files are kept in the browser's private on-device storage (OPFS) so the engine can restore them automatically after a restart. Projects are saved as portable JSON .stios files that download to your machine and reopen on any device (legacy .sty project files still open).

Multiple open datasets

Statios supports frames — multiple datasets open at once, each with its own tab above the data view. Right-click a tab for: Properties, Duplicate, Rename, Export, Close.

This is the same model as Stata's frames and SPSS's multi-dataset windows.

Variable metadata

Two views per dataset:

• Data View — values, one row per observation
• Variable View — metadata, one row per variable (name, label, type, measure, role, missing)

Setting the right measurement level (scale, ordinal, nominal) is important — many analyses filter the variable picker by measure to prevent statistical mistakes (e.g. you can't drag a string variable into an ANOVA's outcome slot).

Supported file formats

Format	Read	Write	Notes
CSV / TSV	✓	✓	Auto-encoding detection
Excel (.xlsx, .xls)	✓	✓	First sheet
SPSS (.sav)	✓	✓	Preserves labels, value labels, measure
Stata (.dta)	✓	✓	Preserves labels
JSON	✓	✓	Records or columnar