> ## Documentation Index
> Fetch the complete documentation index at: https://docs.macrobymark.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Labs (Econometric Tools)

> Stationarity tests, diagnostics, and other econometric utilities.

# Labs

The Labs endpoints expose econometric tools that run server-side on your
data. These are the same engines that power the platform's internal
analysis features.

## Stationarity testing

Test whether a time series is stationary using three standard tests:

* **ADF** (Augmented Dickey-Fuller) - tests the null of a unit root
* **KPSS** - tests the null of stationarity
* **PP** (Phillips-Perron) - non-parametric unit root test

```bash theme={null}
curl -X POST https://macrobymark.com/api/labs/stationarity \
  -H "X-API-Key: YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "observations": [100, 101.2, 99.8, 102.5, ...],
    "dates": ["2020-01-01", "2020-02-01", ...]
  }'
```

## Series diagnostics

Run a comprehensive diagnostic suite that includes autocorrelation analysis,
normality tests, structural break detection, and seasonal decomposition:

```bash theme={null}
curl -X POST https://macrobymark.com/api/labs/diagnostics \
  -H "X-API-Key: YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "observations": [100, 101.2, 99.8, 102.5, ...],
    "dates": ["2020-01-01", "2020-02-01", ...],
    "frequency": "monthly"
  }'
```