Prediction apportionments and their extent of inequality measured by the PSI-based and PSP-based indexes for the 2024 election of the European Parliament

apportionments_pop_2021_pred_2024.xlsx This is a dataset containing prediction apportionments of seats for the 2024 election of the European Parliament (EP). This prediction is based on population data from the 2021 census held by Eurostat. See our paper for the standard function, configurations of parameters, and d-rounding rules we used for calculation. Note: We recommend readers who are not so well informed about apportionment problems and rounding rules see https://www.census.gov/library/video/2021/what-is-apportionment.html or https://www.census.gov/history/www/reference/apportionment/methods_of_apportionment.html. <br> Data interpretations for this dataset are as follows. 4 worksheets: <strong>all</strong>: prediction apportionment results of all configurations under the assumption that the membership remains unchanged and the total number of seats is between 705 (current total number of seats) and 750 (statutory threshold). <strong>no_lose</strong>: prediction apportionment results under the following assumptions: (1) the membership remains unchanged; (2) any Member State does not lose any seats from the current distribution of seats; (3) and the total number of seats is between 705 and 750. <strong>increase_no_lose</strong>: prediction apportionment results under the following assumptions: (1) the membership remains unchanged; (2) any Member State with an increasing population does not lose any seats from the current distribution of seats; (3) and the total number of seats is between 705 and 750. <strong>response</strong>: prediction apportionment results under the following assumptions: (1) the membership remains unchanged; (2) any Member State with an increasing population does not lose any seats from the current distribution of seats while any Member State with a decreasing population does not gain seats; (3) and the total number of seats is between 705 and 750. Meanings of column names: <strong>State</strong>: name of Member State of the European Union <strong>p_2011</strong>: population data from the 2011 census (data source: https://ec.europa.eu/eurostat/web/population-demography/population-housing-censuses/database) <strong>p_2021</strong>: population data from the 2021 census (data source: https://ec.europa.eu/eurostat/statistics-explained/index.php?title=Population_and_housing_census_2021_-_population_grids&amp;stable=1#Distribution_of_European_population) <strong>stat_2020</strong>: current distribution of seats in the EP (data source: https://www.europarl.europa.eu/news/en/headlines/eu-affairs/20180126STO94114/infographic-how-many-seats-does-each-country-get-in-in-the-european-parliament) <strong>other columns</strong>: composed in the order of "a", "gamma", "d-rounding rule", and "the total number of seats (S)". <br> indexes_pop_2021_pred_2024.csv This is a dataset presenting the extent of the PSI-based inequality index (index based on Population Seat Index) and the conventional PSP-based index (index based on the proportion of seats to population) of all prediction apportionments of seats for the 2024 election of the European Parliament (EP). This prediction is based on population data from the 2021 census held by Eurostat. See our paper for the standard function, configurations of parameters, and d-rounding rules used for calculation and the PSI-based index and PSP-based index used for evaluation. Data interpretations for this dataset are as follows. Meanings of column names: <strong>a</strong>: configuration of the standard function <strong>gamma</strong>: configuration of the standard function <strong>rounding</strong>: d-rounding rule used for obtaining a whole number <strong>S</strong>: the total number of seats in the prediction <strong>x_min</strong>: the minimum number of seats in the prediction apportionment <strong>x_max</strong>: the maximum number of seats in the prediction apportionment <strong>inequality index</strong>: maximum of PSI divided by minimum of PSI <strong>psp_max/psp_min</strong>: maximum of PSP divided by minimum of PSP <br>

apportionments_pop_2021_pred_2024.xlsx：本数据集包含2024年欧洲议会（European Parliament, EP）席位分配预测结果。该预测基于欧盟统计局（Eurostat）公布的2021年人口普查数据。有关本次计算所采用的标准函数、参数配置及d轮次规则（d-rounding rule），请参阅我们的研究论文。注意：若读者对席位分配问题与轮次规则不甚了解，可参阅https://www.census.gov/library/video/2021/what-is-apportionment.html 或 https://www.census.gov/history/www/reference/apportionment/methods_of_apportionment.html。

本数据集的数据说明如下：
本数据集包含4个工作表：
1. **all**：在欧盟成员国数量保持不变、总席位数介于当前席位数705与法定上限750之间的假设条件下，所有配置方案的席位分配预测结果。
2. **no_lose**：满足以下三项假设的席位分配预测结果：(1) 欧盟成员国数量保持不变；(2) 任一成员国均不会出现席位较当前分配方案减少的情况；(3) 总席位数介于705至750之间。
3. **increase_no_lose**：满足以下三项假设的席位分配预测结果：(1) 欧盟成员国数量保持不变；(2) 人口增长的成员国均不会出现席位较当前分配方案减少的情况；(3) 总席位数介于705至750之间。
4. **response**：满足以下三项假设的席位分配预测结果：(1) 欧盟成员国数量保持不变；(2) 人口增长的成员国均不会出现席位较当前分配方案减少的情况，同时人口减少的成员国均不会获得额外席位；(3) 总席位数介于705至750之间。

各列名含义如下：
- **State**：欧盟成员国名称
- **p_2011**：2011年人口普查数据（数据来源：https://ec.europa.eu/eurostat/web/population-demography/population-housing-censuses/database）
- **p_2021**：2021年人口普查数据（数据来源：https://ec.europa.eu/eurostat/statistics-explained/index.php?title=Population_and_housing_census_2021_-_population_grids&stable=1#Distribution_of_European_population）
- **stat_2020**：欧洲议会当前席位分配方案（数据来源：https://www.europarl.europa.eu/news/en/headlines/eu-affairs/20180126STO94114/infographic-how-many-seats-does-each-country-get-in-in-the-european-parliament）
- **其他列**：依次为「参数a」「参数gamma」「d轮次规则」以及「预测总席位数(S)」。

indexes_pop_2021_pred_2024.csv：本数据集展示了2024年欧洲议会席位分配预测结果中，基于人口席位指数（Population Seat Index, PSI）的不平等指数，以及基于席位与人口占比（Proportion of Seats to Population, PSP）的传统不平等指数的分布情况。该预测基于欧盟统计局（Eurostat）公布的2021年人口普查数据。有关本次计算所采用的标准函数、参数配置、d轮次规则，以及本次评估所使用的PSI与PSP类不平等指数的详细信息，请参阅我们的研究论文。

本数据集的数据说明如下：
各列名含义如下：
- **a**：标准函数的配置参数
- **gamma**：标准函数的配置参数
- **rounding**：用于生成整数席位分配结果的d轮次规则
- **S**：预测的欧洲议会总席位数
- **x_min**：本次预测中各成员国获得的最少席位数
- **x_max**：本次预测中各成员国获得的最多席位数
- **inequality index**：PSI最大值与PSI最小值的比值
- **psp_max/psp_min**：PSP最大值与PSP最小值的比值