Deriving standard error of WTP in contingent valuation

[Eleanya Nduka]

Thanks to Joao Pedro Azevedo and P. Wilner Jeanty for developing codes for the Turnbull estimation of E(WTP) and wtpcikr respectively.
I have three questions please: (1) How can I derive standard error of E(WTP) value after applying the wtpcikr code?
(2) How can I derive standard errors of E(WTP) values from the Turnbull estimation?
(3) Are there Stata codes to derive confidence interval and standard errors of E(WTP) from the two versions of truncated mean calculations?
Thank you very much.

[Eleanya Nduka]

I have resolved this issue through the delta process.

[KHALID JOYA]

Hi dear!
I am khalid joya, could you please let me know how you fine standard error for wtp. cause I have the same problem and I do not know how to solve it. Thank you