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AI 社科论文应用教学!如何用 AI 从新闻和公告中发现事件变量!

AI 社科论文应用教学!如何用 AI 从新闻和公告中发现事件变量!

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本文基于 Barcelona School of Economics(BSE)工作论文:

Mayoral, L., Mueller, H., Philipp, M., Rauh, C., & Vassallo, R. (2026).Semantic Similarity Measures in Newspaper Text for Detecting and Predicting Disruptive Institutional EventsBSE Working Paper No. 1555

研究使用全球新闻文本与机器学习方法,构建制度性冲击的识别与预测框架,覆盖政变、任期延长与司法系统弱化等事件类型。

作者来自 Barcelona School of Economics(BSE)、Universitat Pompeu Fabra(UPF)等机构,研究方向集中在政治经济学与文本数据建模。


数据来源与事件定义

研究构建了跨国制度性事件数据集,覆盖三类核心事件:

  • • 军事政变(Coup d’état)
  • • 任期限制规避(Term-limit evasion)
  • • 司法系统弱化(Judiciary weakening)

数据来源包括多个权威事件数据库:

  • • Cline Center Coup Dataset
  • • Powell & Thyne Coup Data
  • • Versteeg et al. term-limit dataset
  • • Helmke judicial manipulation data
  • • DEED(Democratic Erosion Event Dataset)

最终形成覆盖 194个国家、1989年以来的月度面板数据


新闻数据部分来自全球主流媒体数据库:

  • • Factiva
  • • LexisNexis
  • • BBC Monitor
  • • Associated Press
  • • The New York Times
  • • The Economist
  • • LatinNews

总规模约 600万条新闻标题,按国家与月份进行结构化整理。


方法链条:从新闻到风险变量

研究的核心是将新闻文本转化为可用于统计建模的风险指标,整体流程可以分为四个连续步骤。


文本向量化(语义空间构建)

每条新闻标题首先被映射到向量空间。

中文场景下推荐的 embedding 模型为:

Kingsoft-LLM/QZhou-Embedding-Zh(MTEB #1Tencent/Youtu-Embedding(工业级强基线)

这些模型在语义排序任务中表现稳定,适用于事件检测场景。

from sentence_transformers import SentenceTransformermodel = SentenceTransformer("Kingsoft-LLM/QZhou-Embedding-Zh")vec = model.encode("军方宣布接管国家政权")

输出为高维语义向量,用于表示新闻在语义空间中的位置。


事件语义原型(Prototype)

每类制度性事件通过“语义原型”进行定义。

原型由40–70条典型新闻标题构成,例如:

  • • military takeover
  • • constitutional manipulation
  • • judicial intervention

这些样本经过 embedding 后取平均,形成事件中心向量。

import numpy as npevent_vec = np.mean(model.encode([    "军队进入首都并控制政府机构",    "政府宣布解散议会",    "军事力量接管国家政权"]), axis=0)

这一向量代表某类制度性冲击的语义中心。


语义匹配(风险强度测量)

每条新闻与事件原型计算余弦相似度:

from sklearn.metrics.pairwise import cosine_similarityscore = cosine_similarity([news_vec], [event_vec])[0][0]

该分数用于刻画新闻与制度性冲击语境之间的接近程度。

在这一阶段,每条新闻被转化为一个连续风险信号。


国家-月份风险指标

在文章层面完成计算后,进一步聚合到国家-月份:

Risk(i,t) = mean similarity(all headlines in country i at month t)

同时构建补充统计量:

  • • 最大相似度(max)
  • • Top-k平均
  • • 标准差(离散程度)
  • • 新闻数量(coverage)

这些变量共同构成文本驱动的风险特征体系。


事件识别模型(Nowcasting)

在事件识别阶段,研究使用监督学习模型判断某国某月是否发生制度性冲击。

主要模型为:

  • • XGBoost(主模型)
  • • LightGBM
  • • CatBoost

输入变量包括三类信息:

语义特征

  • • mean / max / std similarity
  • • top-k similarity

文本结构特征

  • • 新闻数量
  • • LDA主题分布

历史结构特征

  • • 距离上次事件时间
  • • 最近事件频率
  • • 选举周期变量

输出为:

事件发生概率(0–1)


模型在不同事件类型上的表现稳定:

  • • Coup:AUC ≈ 0.90
  • • Term-limit evasion:AUC ≈ 0.92
  • • Judiciary weakening:AUC ≈ 0.80

embedding特征在所有类别中均提供稳定增益。


事件预测(12个月滚动预测)

在识别基础上,研究进一步构建预测模型,用于估计未来12个月内事件发生概率。

方法采用 expanding window 设计:

  • • 每月更新训练样本
  • • 仅使用历史数据训练
  • • 输出未来12个月风险概率

核心模型为 Random Forest,通过多棵树集成建模非线性关系。

输入变量延续识别阶段特征,并加入时间衰减与长期历史结构信息。


中文场景实现路径

该方法可直接迁移至中文新闻与政策文本分析任务。

参考榜单:

https://huggingface.co/spaces/mteb/leaderboard

推荐 embedding 模型:

模型
位置
QZhou-Embedding-Zh
MTEB #1
Tencent/Youtu-Embedding
工业强基线
Seed / Conan 系列
次优替代

中文实现示例

from sentence_transformers import SentenceTransformerfrom sklearn.metrics.pairwise import cosine_similarityimport numpy as npmodel = SentenceTransformer("Kingsoft-LLM/QZhou-Embedding-Zh")event_vec = np.mean(model.encode([    "政府解散议会并接管司法系统",    "军方宣布接管国家政权",    "修改宪法延长总统任期"]), axis=0)news_vecs = model.encode([    "总统宣布解散最高法院",    "议会通过宪法修正案",    "经济政策保持稳定"])scores = cosine_similarity(news_vecs, [event_vec]).flatten()risk_index = np.mean(scores)

方法结构总结

整体系统可以抽象为:

新闻标题→ embedding(QZhou / Youtu)→ prototype similarity→ country-month aggregation→ XGBoost nowcast→ Random Forest forecast

结论

该研究构建了一套基于语义相似度的制度性风险测度框架,将全球新闻文本转化为连续可计算的风险时间序列,并进一步用于事件识别与预测。

其核心结构可以概括为:

用 embedding 空间中的语义距离,将新闻转化为制度性风险信号,并在时间维度上构建可预测的风险轨迹。

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  1. CONNECT:[ UseTime:0.000716s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001167s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000408s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000337s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000646s ]
  6. SELECT * FROM `set` [ RunTime:0.000257s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000905s ]
  8. SELECT * FROM `article` WHERE `id` = 785791 LIMIT 1 [ RunTime:0.000540s ]
  9. UPDATE `article` SET `lasttime` = 1782313349 WHERE `id` = 785791 [ RunTime:0.000966s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000285s ]
  11. SELECT * FROM `article` WHERE `id` < 785791 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000605s ]
  12. SELECT * FROM `article` WHERE `id` > 785791 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000486s ]
  13. SELECT * FROM `article` WHERE `id` < 785791 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000988s ]
  14. SELECT * FROM `article` WHERE `id` < 785791 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000888s ]
  15. SELECT * FROM `article` WHERE `id` < 785791 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001302s ]
0.097635s