**Logistic regression** is a type of a classification algorithm (see http://en.wikipedia.org/wiki/Logistic_regression). This algorithm can be used to predict probabilities associated with a class or an event occurring. A classification problem with multiple classes can be reduced to a binary classification problem. In this simplest case, a high probability for one class, means a low probability for another class. Logistic regression is based on the
**logistic function**, which has values in the range between 0 and 1—just like for probabilities. The logistic function can therefore be used to transform arbitrary values into probabilities.

We can define a function that performs classification with logistic regression. ...

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