很简单，用CIA Worldbook 2007的数据，用GDP based on PPP 除以 Nominal GDP based on exchange rate. 所有数据以美元计价，所以美国的基数是1. 数字越大，表示该国货币越undervalued, 购买力越强。基本规律是，北欧，西欧发达国家排名靠前，亚洲非洲国家偏后，中国是3.83，也就是说用同样的钱在美国可以买到一个单位，而在中国可以买到3.83个单位的货物或服务，即一美元在美国的购买力大约相当于在中国的两个人民币。这个序列和 nominal per capta GDP 几乎是perfectly posotively correlated. 和BigMac Index也基本一致。
当然，篮子里的货物和权重不同，得出的结果也会有一些区别，比如说有人喜欢吃牛排，有人喜欢吃煎饼果子，有人喜欢开宝马，有人喜欢坐地铁，有人喜欢自己割草打扫卫生，有人喜欢雇三个保姆。但这些数字应该是对普通人，对国计民生来说最公正，最精确的估计了。
Norway 0.645040241
Denmark 0.705432977
Switzerland 0.729011628
Luxembourg 0.744299065
Iceland 0.763570108
Ireland 0.788514851
Sweden 0.809341383
Kuwait 0.828571429
Netherlands 0.847234043
Finland 0.865652174
France 0.865652174
Japan 0.928771285
Venezuela 1.291692737
Zambia 1.324426597
Trinidad and Tobago 1.328568421
Estonia 1.574873737
Panama 1.587301587
Czech Republic 1.594636556
Oman 1.602083333
Chile 1.610013055
Dominica 1.636363636
Poland 1.668387097
Hungary 1.741062562
Brazil 1.754919355
Slovakia 1.758372922
Guatemala 1.810142857
Côte d'Ivoire 1.814015611
Grenada 1.836734694
Belize 1.869158879
Lithuania 1.909583333
Romania 1.910884354
Fiji 1.923666667
Russia 1.954022989
Albania 1.955944334
Benin 2.224165815
Algeria 2.249829669
Georgia 2.311688312
South Africa 2.316746575
Costa Rica 2.354593599
Jordan 2.363333333
Djibouti 2.395804771
Botswana 2.425186722
Chad 2.524833317
Bulgaria 2.596
Belarus 2.606877606
Mali 2.608124969
Tanzania 2.61226108
Morocco 2.634294294
Namibia 2.673873518
Syria 2.696348461
Mauritius 2.750304083
Bolivia 2.754604811
Armenia 2.756697467
Dominican Republic 2.758546656
Colombia 2.767465327
Mongolia 2.801101824
Indonesia 2.844079143
Samoa 2.874375
Iran 2.949557268
Honduras 2.966248038
Cape Verde 2.967139001
Thailand 2.971137255
Papua New Guinea 3.004215686
Tunisia 3.025
Comoros 3.064410224
Burkina Faso 3.074782302
Moldova 3.156490385
Niger 3.171055825
Solomon Islands 3.17952381
Argentina 3.1815625
Azerbaijan 3.190714286
Haiti 3.305834018
Pakistan 3.403835307
Egypt 3.428143713
Paraguay 3.582172491
Madagascar 3.678164832
Mauritania 3.743101545
Sierra Leone 3.748844981
Ukraine 3.825757576
China 3.831730769
Sri Lanka 3.973633932
Kyrgyzstan 3.975148515
Tajikistan 4.024390244
Laos 4.029733805
Philippines 4.03511811
Tonga 4.0554
Togo 4.161411053
Guyana 4.275832622
Nicaragua 4.309313725
Guinea-Bissau 4.316428512
Uzbekistan 4.328909078
Lesotho 4.448051948
São Tomé and Príncipe 5.514268456
Nepal 5.71340694
Kiribati 6.038636364
Suriname 6.048773585
Cambodia 6.211208332
Gambia, The 6.261061947
Burundi 6.31127451
