st: "weighed centiles"

[Cinzia Rienzo <C.Rienzo@rhul.ac.uk>]

Dear all 
i have to compute the gap centile  (90-10) for the variable "res1st_zs" 
 and weighed by the variable "hwt" for time series data. 
But STATA does not allow me weighed centile, i also tried the "dialog" 
but i didn t get the results i wanted.
Any suggestions?

Thanks  a lot 

Cinzia
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