| back_test | Out-of-sample prediction for whole period | 
| evaluation_table | Out-of-sample prediction evaluation | 
| load_5y_search_data | Load Goolge Trends data and initial claims data | 
| load_claim_data | Load unemployment initial claims data | 
| prism | PRISM function | 
| prism_batch | PRISM stage 2 by batch | 
| var_generator | PRISM regressors generator |