4. 변수 변환 4-1. log 변환 import numpy as np data['log_salary'] = np.log(data['salary']) data['log_sales'] = np.log(data['sales']) data['log_roe'] = np.log(data['roe']) data.head() data.hist(bins=50, figsize=(20, 15)) data.corr() 4-2. 제곱근 변환 data['sqrt_salary'] = np.sqrt(data['salary']) data['sqrt_sales'] = np.sqrt(data['sales']) data['sqrt_roe'] = np.sqrt(data['roe']) data.head() data.hist(bins=50, ..
