Some minor updates:
- 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')
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.