Dear all,

I am struggling with my RD specification. I am using the rdrobust package from SSC and when I try to compute the optimal bandwidth using rdbwselect with fuzzy option I am getting alerts as

Code:
Not enough variability to compute the preliminary bandwidth. Try checking for mass points with option masspoints(check).
Not enough variability to compute the bias bandwidth (b). Try checking for mass points with option masspoints(check). 
Not enough variability to compute the loc. poly. bandwidth (h). Try checking for mass points with option masspoints(check)
but adding the option as required nothing changes and I keep getting the same alert.

My running variable is population and its distribution is quite skewed

Array

so my feeling is that this is the issue with the bandwidth computation.

Do you have any insight about it? Maybe some trick to group population in some way it will increase variability?