Figure 8.
Two side by side plots present estimated effects by letter category for Europe and Northern Italy. In the Europe plot, the vertical axis shows centuries with self-government by 1200, ranging from about 0.2 to 1.2. The no letter category shows a low estimate around 0.15 with a narrow range. The letter mentioning investiture category shows a higher estimate around 0.85 with a range from about 0.6 to 1.1. The other letter category shows an estimate around 0.55 with a range from about 0.4 to 0.7. In the Northern Italy plot, the vertical axis shows years with self-government by 1200, ranging from about 20 to 100. The no letter category shows an estimate around 23 with a range from about 18 to 28. The letter mentioning investiture category shows an estimate around 70 with a range from about 55 to 85. The other letter category shows an estimate around 75 with a range from about 60 to 88.Letter content and self-government
Note(s): Based on models (2) and (5) from Table 2 splitting the treatment dummy into two variables. One equal to 1 if a letter concerning investiture has been received, and another equal to 1 if a letter has been received but no letter has been received which centered on investiture. 95% confidence intervals