[{'role': 'system', 'content': "You are an expert in machine learning and your task is to classify the code snippets into categories from the provided list of categories. List of categories: ['helper_functions', 'load_data', 'data_exploration', 'data_preprocessing', 'evaluation', 'modelling', 'prediction', 'result_visualization', 'save_results', 'comment_only']"}, {'role': 'user', 'content': "Identify to which category the provided code belongs and assign the code snippet to at least 1 but up to 5 categories based on the probabilities, ignore if the probability of the category is negligible. Strictly provide your response as a list. Avoid providing any additional information, commentary, or personal opinions.\\nPython Code:import numpy as np\nimport scipy\nfrom scipy import stats\nsmalldf=clean_hospital_read_df\nsmalldf_r=smalldf[smalldf['Number of Discharges'] < 100]\nlargedf=clean_hospital_read_df\nlargedf_r=largedf[largedf['Number of Discharges'] > 1000]\nsmalldf_NumReAd_isin=smalldf_r['Number of Readmissions'].isin(smalldf_r['Number of Readmissions'])\nlargedf_NumReAd_isin=largedf_r['Number of Readmissions'].isin(largedf_r['Number of Readmissions'])\nscipy.stats.ttest_ind(smalldf_r['Number of Readmissions'][smalldf_NumReAd_isin], largedf_r['Number of Readmissions'][largedf_NumReAd_isin], axis=0, equal_var=False)"}, {'role': 'assistant', 'content': "['helper_functions', 'data_exploration', 'data_preprocessing']"}]