Leonardo

DataFrameMapper changes columns types when default=None.

4

When I use `DataFrameMapper` and set up `default=None` to transform a column, all other columns types are changed to `object`. But this does not happen when I have only `float`...

add requirements.txt

1

Could you a `requirements.txt` file? It will be easier to run your codes.

The notebook [Violations_of_Regression_Models](https://github.com/quantopian/research_public/blob/master/notebooks/lectures/Violations_of_Regression_Models/notebook.ipynb) says that "for the 5 most recent datapoints, a significant correlation exists with the current". **Why, since**: 1. we have 9 values different from zero (very low...