## Evaluation

Submissions are evaluated using the **Gini coefficient**, calculated as:

$$
\text{Gini} = 2 \cdot \text{AUC} - 1
$$

Higher Gini indicates better ranking of positive vs negative cases.

Participants should submit **predicted probabilities for the price increase (target = 1)**.

---

## Submission File

For each date in the test set, you must predict a probability for the **target** variable. The file must contain a header and follow this format:

```
date,target
2025-10-02,0
2025-10-03,0
2025-10-04,0
...
2025-10-31,0
```

Each row should contain the predicted probability that the price will **increase** on that date.

**File name:** `submission.csv`