Some minor updates for Python Edition 1 only:

All change have been included from edition 2 onwards. Many thanks to Oni Sanyal, Meng Gao, Thi Mai Luong and Lu Li for their careful reading and making great suggestions to improve the book and related works. The changes are:

• Chapter 6.2: change "ref = data.sample(int(0.8*len(data)), random_state=12345).index" to "ref = sample.sample(int(0.8*len(sample)), random_state=12345).index"
  
• Chapter 6.2.3: change "data.loc[:,'FICO_fit'] = pd.DataFrame(fico_ols.predict(data))" to "data['FICO_fit'] = pd.DataFrame(fico_ols.predict(data))"
  
• Chapter 6.5: delete data = pd.read_csv('C:/TMP/mortgage_ML.csv')

Here is the start video if you have downloaded the code dcr.py prior to the release of Edition 2:

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