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I am looking for a challenge that is suitable for a group of novices who want to learn the basics of data science and machine learning. The challenge should match the following criteria:

- is based on a real application or is at least realistic
- has a clearly defined goal and partial progress is measurable
- includes a machine learning component, but also other aspects of data science
- should be doable within 3 to 6 weeks
- is suitable for novices
- it should be an actual challenge in the sense that you cannot just look up near-optimal solutions from the internet

1Why is this tagged "Kaggle"? – Neil Slater – 2017-01-17T10:04:58.377

Because kaggle is a potential source, although I didn't really find something fitting among the current competitions. – clstaudt – 2017-01-17T15:00:51.010