Based on prior knowledge, the Oldpeak value measured in depression is an important indicator for heart disease. Typically, higher values of Oldpeak indicate a higher likelihood of heart disease. To analyze the relationship between Oldpeak and the presence of heart disease, we can compare the Oldpeak values for patients with and without heart disease.

Here is the dictionary for the relationship between Oldpeak and the target class:

```json
{
	"no": [0.0, 0.5, 1.0, 1.5, 2.0],
	"yes": [2.0, 2.5, 3.0, 3.5, 4.0]
}
```

In the "no" class (patients without heart disease), typical Oldpeak values might range from 0.0 to 2.0, with common values being 0.0, 0.5, 1.0, 1.5, and 2.0.

In the "yes" class (patients with heart disease), typical Oldpeak values might range from 2.0 to 4.0, with common values being 2.0, 2.5, 3.0, 3.5, and 4.0.