【作者(必填)】AndrésAzqueta-Gavaldón

【文题(必填)】Developing news-based economic policy uncertainty index with unsupervised machine learning

【年份(必填)】2017

【全文链接或数据库名称(选填)】https://www.sciencedirect.com/science/article/abs/pii/S0165176517302598?casa_token=yjwvpqtTUacAAAAA:39lRg3g93f1QRKi_NH_8eqwHdHTxeZWD0oSWFZP-QQiUYJ4u004z-htYMHiSAwVFcS0nFvQUEac