Small edit to remove redundant title in RD vignette

DeclareDesign · Jul 4, 2018 · 7269da8 · 7269da8
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diff --git a/vignettes/regression_discontinuity.Rmd b/vignettes/regression_discontinuity.Rmd
@@ -17,7 +17,7 @@ library(ggplot2)
 library(knitr)
 ```
 
-## Regression Discontinuity
+
 
 Regression discontinuity designs exploit substantive knowledge that treatment is assigned in a particular way: everyone above a threshold is assigned to treatment and everyone below it is not. Even though researchers do not control the assignment, substantive knowledge about the threshold serves as a basis for a strong identification claim.