st: brrweight(), jkrweight(), and vce() options of svyset

[Sergiy Radyakin <serjradyakin@gmail.com>]

Dear All,

can somebody, please, explain why the brrweight(varlist) and jkrweight(varlist)
in svyset are NOT mutually exclusive? My understanding is that after I

svyset ...whatever...,vce(brr) brrweight(varlist)

specyfying jkrweight() afterwards in the same command does not affect
anything. However the standard Stata dialog for svyset (db svyset) permits
specifying both BRR and Jackknife weights and svyset command accepts
both without a problem.

I guess the minimum information needed to be specified is:
1) brrweight(varlist) -- translates to current vce(brr) brrweight(varlist)
2) jkrweight(varlist) -- translates to current vce(jackknife) jkrweight(varlist)
3) nothing -- translates to current vce(linearized)

Meaning that the vce() option is redundant and brrweight() and jkrweight() must
be mutually exclusive.

Does it harm in any way specifying both?
Is there benefit/convenience in specifying both?

Any hints are very welcomed.

Thank you, Sergiy Radyakin.
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